Heat Transfer Across Metal-Dielectric Interfaces During Ultrafast-Laser Heating
Liang Guo, Stephen L. Hodson, Timothy S. Fisher, and Xianfan Xu
Heat transfer across metal-dielectric interfaces involves transport of electrons and phonons accomplished either by coupling between phonons in metal and dielectric or by coupling between electrons in metal and phonons in dielectric. In this work, we investigate heat transfer across metal-dielectric ... [J. Heat Transfer 134, 042402 (2012)] published Mon Feb 13, 2012.
High-energy metal ion implantation for reduction of surface resistivity of alumina ceramic
V. I. Gushenets, A. G. Nikolaev, E. M. Oks, K. P. Savkin, G. Yu. Yushkov et al.
In this work, the possibility to increase the surface conductivity of ceramic insulators through their treatment with accelerated metal ion beams produced by a MevvaV.Ru vacuum arc source is demonstrated. The increase in surface conductivity is made possible due to experimental conditions in which a ... [Rev. Sci. Instrum. 83, 02B908 (2012)] published Mon Feb 13, 2012.
Models of radiofrequency coupling for negative ion sources
M. Cavenago and S. Petrenko
Radiofrequency heating for ICP (inductively coupled plasma) ion sources depends on the source operating pressure, the presence or absence of a Faraday shield, the driver coil geometry, the frequency used, and the magnetic field configuration: in negative ion source a magnetic filter seems necessary ... [Rev. Sci. Instrum. 83, 02B503 (2012)] published Mon Feb 13, 2012.
Study on rare-earthdoped type-I germanium clathrates
Xiaohui Zhu, Ning Chen, Lihua Liu, and Yang Li
The synthesis of rare-earth clathrates REBaGaGe is a challenging task. The Group IV clathrates with rare-earth doping are hardly to be experimentally prepared, except Eu clathrate. In the current study, the first-principle method based on the density functional theory was implemented. The effects of ... [J. Appl. Phys. 111, 07E305 (2012)] published Mon Feb 13, 2012.
Real-time synchrotoron radiation X-ray diffraction and abnormal temperature dependence of photoluminescence from erbium silicates on SiO/Si substrates
H. Omi, T. Tawara, and M. Tateishi
The erbium silicate formation processes during annealing in Ar gas were monitored by synchrotron radiation grazing incidence X-ray diffraction (GIXD) in real time and the optical properties of the silicates were investigated by photoluminescence measurements in spectral and time-resolved domains. Th ... [AIP Advances 2, 012141 (2012)] published Mon Feb 13, 2012.
Lattice cluster theory of associating polymers. I. Solutions of linear telechelic polymer chains
Jacek Dudowicz and Karl F. Freed
The lattice cluster theory (LCT) for the thermodynamics of a wide array of polymer systems has been developed by using an analogy to Mayer's virial expansions for non-ideal gases. However, the high-temperature expansion inherent to the LCT has heretofore precluded its application to systems exhibiti ... [J. Chem. Phys. 136, 064902 (2012)] published Mon Feb 13, 2012.
Commensurate-incommensurate transition of He adsorbed on a single C molecule
Hyeondeok Shin and Yongkyung Kwon
Path-integral Monte Carlo calculations have been performed to study He adsorption on a single C molecule. Helium corrugations on the fullerene molecular surface are incorporated with the He-C interaction described by the sum of all He-C interatomic pair potentials. Radial density distributions show ... [J. Chem. Phys. 136, 064514 (2012)] published Mon Feb 13, 2012.
Dynamics near a liquid-liquid phase transition in a non-tetrahedral liquid: The case of gallium
Samuel Cajahuaringa, Maurice de Koning, and Alex Antonelli
We use molecular simulation to analyze liquid dynamics in the vicinity of the liquid-liquid phase transition (LLPT) recently discovered in the modified embedded-atom model for elemental gallium. For this purpose we analyze the diffusive behavior in terms of the mean-squared displacement and self-int ... [J. Chem. Phys. 136, 064513 (2012)] published Mon Feb 13, 2012.
Deep ultraviolet and visible crystalloluminescence of sodium chloride
Andrew J. Alexander
A protocol has been developed for production of intense crystalloluminescence (XTL) from sodium chloride in aqueous solution by selective doping with transition metal salts (Ag, Cu, and Dy). The method was used to record complete, fully dispersed deep UVvisible (200650 nm) XTL spectra of sodium chlo ... [J. Chem. Phys. 136, 064512 (2012)] published Mon Feb 13, 2012.
Shear-band arrest and stress overshoots during inhomogeneous flow in a metallic glass
R. Maass, D. Klaumunzer, G. Villard, P. M. Derlet, and J. F. Loffler
At the transition from a static to a dynamic deformation regime of a shear band in bulk metallic glasses, stress transients in terms of overshoots are observed. We interpret this phenomenon with a repeated shear-melting transition and are able to access a characteristic time for a liquidlike to soli ... [Appl. Phys. Lett. 100, 071904 (2012)] published Mon Feb 13, 2012.
ON-OFF switching mechanism of resistiverandomaccessmemories based on the formation and disruption of oxygen vacancy conducting channels
Katsumasa Kamiya, Moon Young Yang, Seong-Geon Park, Blanka Magyari-Kope, Yoshio Nishi et al.
We study the ON-OFF switching mechanism of oxide-based resistiverandomaccessmemories using theoretical calculations. Electron deficient vacancies (V) up to 1+ charge states would stabilize a cohesive filament, while further electron removal will stabilize the disrupted V configurations with 2+ charg ... [Appl. Phys. Lett. 100, 073502 (2012)] published Mon Feb 13, 2012.
Stretch-induced plasmonic anisotropy of self-assembled gold nanoparticle mats
Matthew G. Millyard, Fu Min Huang, Richard White, Elisabetta Spigone, Jani Kivioja et al.
Close-packed monolayers of 20 nm Au nanoparticles are self-assembled at hexane/water interfaces and transferred to elastic substrates. Stretching the resulting nanoparticle mats provides active and reversible tuning of their plasmonic properties, with a clear polarization dependance. Both uniaxial a ... [Appl. Phys. Lett. 100, 073101 (2012)] published Mon Feb 13, 2012.
Depletion of nitrogen-vacancy color centers in diamond via hydrogen passivation
A. Stacey, T. J. Karle, L. P. McGuinness, B. C. Gibson, K. Ganesan et al.
We show reduction in the emission from nitrogen-vacancy (NV) centers in single crystal diamond due to exposure to hydrogen plasmas ranging from 700 degrees C to 1000 degrees C. Significant fluorescence reduction was observed beneath the exposed surface to 80 [mu]m depth after ~10 min and did not r ... [Appl. Phys. Lett. 100, 071902 (2012)] published Mon Feb 13, 2012.
Asymmetric coalescence of reactively wetting droplets
C. X. Zheng, W. X. Tang, and D. E. Jesson
Coalescence of droplets during reactive wetting is investigated for the liquid Ga/GaAs(001) system. In situ mirror electron microscopy reveals that coalescence predominantly involves the motion of one reactive droplet relative to the other. This behaviour differs significantly from coalescence in no ... [Appl. Phys. Lett. 100, 071903 (2012)] published Mon Feb 13, 2012.
Enhancing magnetic vacancies in semiconductors by strain
Erjun Kan, Fang Wu, Yuemei Zhang, Hongjun Xiang, Ruifeng Lu et al.
Although cation-vacancies can induce localized magnetic moments in semiconductors, the collective magnetism is impeded by low vacancy concentration. To improve the vacancy concentration, we study the effect of external hydrostatic strain on the vacancy formation energy. Our first-principles calculat ... [Appl. Phys. Lett. 100, 072401 (2012)] published Mon Feb 13, 2012.
Scanning tunneling microscope-based local electroluminescence spectroscopy of p-AlGaAs/i-GaAs/n-AlGaAs double heterostructure
Kentaro Watanabe, Masakazu Ichikawa, Yoshiaki Nakamura, Shigeyuki Kuboya, Ryuji Katayama et al.
Local characterization of electroluminescence (EL) from working light-emitting devices is a key to developing and improving their EL properties. The authors developed a scanning tunneling microscope- (STM-) EL technique based on conductive optical fiber probe STM with homemade bipolar sample holder ... [J. Vac. Sci. Technol. B 30, 021802 (2012)] published Mon Feb 13, 2012.
Delta-doping of boron atoms by photoexcited chemical vapor deposition
Housei Akazawa
Boron delta-doped structures in Si crystals were fabricated by means of photoexcited chemical vapor deposition (CVD). Core electronic excitation with high-energy photons ranging from vacuum ultraviolet to soft x rays decomposes BH molecules into fragments. Combined with in situ monitoring by spectro ... [J. Vac. Sci. Technol. A 30, 021504 (2012)] published Mon Feb 13, 2012.
Origin of 2.7 [mu]m luminescence and energy transfer process of Er: I-->I transition in Er/Yb doped germanate glasses
Rongrong Xu (徐茸茸), Ying Tian (田颖), Lili Hu (胡丽丽), and Junjie Zhang (张军杰)
An investigation of spectroscopic property and energy transfer process of Er doped and Er/Yb co-doped germanate glasses is presented. The emission cross section of the I --> I transition of Er doped germanate glass is calculated to be 1.2 x 10 cm. The microparameter of energy transfer from Yb: F t ... [J. Appl. Phys. 111, 033524 (2012)] published Mon Feb 13, 2012.
Thickness effects on the texture development of fluorine-doped SnO thin films: The role of surface and strain energy
V. Consonni, G. Rey, H. Roussel, and D. Bellet
Polycrystalline fluorine-doped SnO thin films have been grown by ultrasonic spray pyrolysis with a thickness varying in the range of 40 to 600 nm. A texture transition from to and crystallographic orientations has experimentally been shown by x-ray diffraction measurements as film thickness is in ... [J. Appl. Phys. 111, 033523 (2012)] published Mon Feb 13, 2012.
Surface diffusion and layer morphology of ((11[overline 2]2)) GaN grown by metal-organic vapor phase epitaxy
Simon Ploch, Tim Wernicke, Duc V. Dinh, Markus Pristovsek, and Michael Kneissl
(11[overline 2]2) GaN layers were grown by metal-organic vapor phase epitaxy on (11[overline 2]2) bulk GaN substrates and (10[overline 1]0) sapphire substrates. The growth temperature was varied between 950 and 1050 degrees C and the total reactor pressure between 50 and 600 mbar. The growth condit ... [J. Appl. Phys. 111, 033526 (2012)] published Mon Feb 13, 2012.
Tuning the Growth Orientation of Epitaxial Films by Interface Chemistry
Matthias Gubo, Christina Ebensperger, Wolfgang Meyer, Lutz Hammer, Klaus Heinz et al.
The support of epitaxial films frequently determines their crystallographic orientation, which is of crucial importance for their properties. We report a novel way to alter the film orientation without changing the substrate. We show for the growth of CoO on the Ir(100) surface that, while the oxide ... [Phys. Rev. Lett. 108, 066101 ] published .
Isotope Fractionation by Thermal Diffusion in Silicate Melts
Daniel J. Lacks, Gaurav Goel, Charles J. Bopp, IV, James A. Van Orman, Charles E. Lesher et al.
Isotopes fractionate in thermal gradients, but there is little quantitative understanding of this effect in complex fluids. Here we present results of experiments and molecular dynamics simulations on silicate melts. We show that isotope fractionation arises from classical mechanical effects, and th ... [Phys. Rev. Lett. 108, 065901 ] published .
Fracture Strength of Disordered Media: Universality, Interactions, and Tail Asymptotics
Claudio Manzato, Ashivni Shekhawat, Phani K. V. V. Nukala, Mikko J. Alava, James P. Sethna et al.
We study the asymptotic properties of fracture strength distributions of disordered elastic media by a combination of renormalization group, extreme value theory, and numerical simulation. We investigate the validity of the weakest-link hypothesis in the presence of realistic long-ranged interaction ... [Phys. Rev. Lett. 108, 065504 ] published .
Quantum Memory Assisted Probing of Dynamical Spin Correlations
O. Romero-Isart, M. Rizzi, C. A. Muschik, E. S. Polzik, M. Lewenstein et al.
We propose a method to probe time-dependent correlations of nontrivial observables in many-body ultracold lattice gases. The scheme uses a quantum nondemolition matter-light interface, first to map the observable of interest on the many-body system into the light and then to store coherently such in ... [Phys. Rev. Lett. 108, 065302 ] published .
Exciton-phonon coupling in individual ZnTe nanorods studied by resonant Raman spectroscopy
Q. Zhang, J. Zhang, M. I. B. Utama, B. Peng, M. de la Mata et al.
The exciton-phonon coupling in high-quality cubic phase zinc telluride (ZnTe) nanorods (NRs) is investigated by resonant micro-Raman spectroscopy near the direct bandgap of ZnTe. The scattering cross section of longitudinal optical (LO) phonon is enhanced significantly in the resonant process, where ... [Phys. Rev. B 85, 085418 ] published .
Reply to Comment on `Rapid chemical and topological ordering in supercooled liquid CuZr'
V. Wessels, A. K. Gangopadhyay, K. K. Sahu, R. W. Hyers, S. M. Canepari et al.
The criticisms of Harvey and Gheribi (HG) are directed towards supporting evidence for ordering in supercooled CuZr liquid from specific heat measurements and molecular dynamics simulations, not on the direct evidence that came from x-ray diffraction studies. In this reply, we demonstrate that the u ... [Phys. Rev. B 85, 066102 ] published .
Comment on Rapid chemical and topological ordering in supercooled liquid CuZr
J.-P. Harvey and A. E. Gheribi
In their recent publication, Wessels et al. [Phys. Rev. B 83, 094116 (2011)] present evidence of rapid ordering in a supercooled CuZr liquid. A part of their supporting argument is based on an experimentally observed peak in the specific heat capacity of a CuZr melt as a function of temperature. The ... [Phys. Rev. B 85, 066101 ] published .
Probing grain boundary sink strength at the nanoscale: Energetics and length scales of vacancy and interstitial absorption by grain boundaries in alpha-Fe
M. A. Tschopp, K. N. Solanki, F. Gao, X. Sun, M. A. Khaleel et al.
The energetics and length scales associated with the interaction between point defects (vacancies and self-interstitial atoms) and grain boundaries in bcc Fe was explored. Molecular statics simulations were used to generate a grain boundary structure database that contained [approximate]170 grain bo ... [Phys. Rev. B 85, 064108 ] published .
EXAFS evidence for a primary Zn dopant in LiNbO
F. Bridges, J. Castillo-Torres, B. Car, S. Medling, and M. Kozina
We present extended x-ray-absorption fine structure (EXAFS) data as a function of temperature (10300 K) at the Zn and Nb K edges for Zn-doped LiNbO. The focus is on higher Zn concentrations (711 mol %) for which there is disagreement in the literature as to the substitution site for Zn. Our data sho ... [Phys. Rev. B 85, 064107 ] published .
Atomistic modeling of As diffusion in ZnO
B. Puchala and D. Morgan
Ab initio methods are used to predict the diffusion coefficient of As dopants in ZnO as a function of Fermi level. Contributions to As diffusion from interstitial, simple substitutional, and cluster diffusion are considered. Formation and migration energies for Zn vacancies (V), As substituting on Z ... [Phys. Rev. B 85, 064106 ] published .
Heat flow in nanostructures in the Casimir regime
Humphrey J. Maris and Shin-ichiro Tamura
In small structures the phonon mean free path due to phonon-phonon interactions and defect scattering may exceed the sample dimensions. The thermal conductivity then becomes dependent on the size and shape of the sample. In this article we present calculations of the conductivity under these conditi ... [Phys. Rev. B 85, 054304 ] published .
Examining the structure and bonding in complex oxides using aberration-corrected imaging and spectroscopy
R. F. Klie, Q. Qiao, T. Paulauskas, Q. Ramasse, M. P. Oxley et al.
Our ability to directly characterize the atomic and electronic structures is crucial to developing a fundamental understanding of structure-property relationships in complex-oxide materials. Here, we examine one specific example, the misfit-layered thermoelectric material CaCoO, which exhibits a hig ... [Phys. Rev. B 85, 054106 ] published .
Microstructure analysis of plasma enhanced atomic layer deposition-grown mixed-phase RuTaN barrier for seedless copper electrodeposition
Tonmoy Chakraborty and Eric T. Eisenbraun
Plasma enhanced atomic layer deposition (PEALD)-grown mixed phase RuTaN films has been studied as a direct plate material for Cu electroplating within interconnects. It was seen that these liners behaved as excellent Cu diffusion barrier and could be scaled down to sub-5 nm thicknesses. High resolut ... [J. Vac. Sci. Technol. A 30, 020604 (2012)] published Fri Feb 10, 2012.
Phononic crystal diffraction gratings
Rayisa P. Moiseyenko, Sarah Herbison, Nico F. Declercq, and Vincent Laude
When a phononic crystal is interrogated by an external source of acoustic waves, there is necessarily a phenomenon of diffraction occurring on the external enclosing surfaces. Indeed, these external surfaces are periodic and the resulting acoustic diffraction grating has a periodicity that depends o ... [J. Appl. Phys. 111, 034907 (2012)] published Fri Feb 10, 2012.
First-principles investigation of pressure-induced phase transition in LiNbO
Kaoru Nakamura, Sadao Higuchi, and Toshiharu Ohnuma
We explore the possible high-pressure phase transition of LiNbO using an evolutionary algorithm combined with first-principles calculations. A NaIO-type structure with Pnma symmetry was predicted as the room temperature phase, and an apatite-like structure with P6/m symmetry was predicted as the hig ... [J. Appl. Phys. 111, 033522 (2012)] published Fri Feb 10, 2012.
Influence of size/crystallinity effects on the cation ordering and magnetism of alpha-lithium ferrite nanoparticles
N. Jovic, M. Prekajski, A. Kremenovic, B. JanCar, V. Kahlenberg et al.
alpha-lithium ferrite (LiFeO) nanoparticles have been prepared using two synthesis routes: citrate gel decomposition as well as the Pechini method. Analysis of HRTEM images of the particles showed that they have a core/shell structure, an average size of ~10 nm and stacking faults parallel to the (1 ... [J. Appl. Phys. 111, 034313 (2012)] published Fri Feb 10, 2012.
Critical lines for an unequal size of molecules in a binary gas-liquid mixture around the van Laar point using the combination of the Tompa model and the van der Waals equation
Mustafa Gencaslan and Mustafa Keskin
We combine the modified Tompa model with the van der Waals equation to study critical lines for an unequal size of molecules in a binary gas-liquid mixture around the van Laar point. The van Laar point is coined by Meijer and it is the only point at which the mathematical double point curve is stabl ... [J. Chem. Phys. 136, 064106 (2012)] published Fri Feb 10, 2012.
Young-Type Interference for Scattering of Fast Helium Atoms from an Oxygen Covered Mo(112) Surface
J. Seifert and H. Winter
In studies on two structures of oxygen adsorbates on Mo(112), we demonstrate the potential of fast atom diffraction to derive the surface unit cell size and its symmetry. Helium atoms with energies of 12 keV are scattered from an adsorbate covered Mo(112) surface along low indexed surface directions ... [Phys. Rev. Lett. 108, 065503 ] published .
Critical behavior of a three-dimensional hardcore-cylinder composite system
Jaime Silva, Ricardo Simoes, and Senentxu Lanceros-Mendez
In this work the critical indices beta, gamma, and nu for a three-dimensional (3D) hardcore cylinder composite system with short-range interaction have been obtained. In contrast to the 2D stick system and the 3D hardcore cylinder system, the determined critical exponents do not belong to the same u ... [Phys. Rev. E 85, 021115 ] published .
Continuous universality in nonequilibrium relaxational dynamics of O(2) symmetric systems
Niladri Sarkar and Abhik Basu
We elucidate a nonconserved relaxational nonequilibrium dynamics of a O(2) symmetric model. We drive the system out of equilibrium by introducing a nonzero noise cross correlation of amplitude D in a stochastic Langevin description of the system, while maintaining the O(2) symmetry of the order para ... [Phys. Rev. E 85, 021113 ] published .
Phonon Raman scattering of RCrO perovskites (R=Y, La, Pr, Sm, Gd, Dy, Ho, Yb, Lu)
M. C. Weber, J. Kreisel, P. A. Thomas, M. Newton, K. Sardar et al.
We report a systematic investigation of orthorhombic perovskite-type RCrO powder samples by Raman scattering for nine different rare earth R cations (R = Y, La, Pr, Sm, Gd, Dy, Ho, Yb, and Lu). The room-temperature Raman spectra and the associated phonon mode assignment provide reference data for st ... [Phys. Rev. B 85, 054303 ] published .
Structural transformation and vibrational properties of BaC at high pressure
I. Efthimiopoulos, K. Kunc, G. V. Vazhenin, E. Stavrou, K. Syassen et al.
We show that the ambient-pressure tetragonal phase of BaC (CaC-type, space group I4/mmm), with sixfold coordination of Ba atoms and C dumbbells, transforms reversibly to a new structure type at 4 GPa; it is an eight-coordinated rhombohedral modification (space group R[overline 3]m), which can be vie ... [Phys. Rev. B 85, 054105 ] published .
Kinetics aspects of initial stage thin gamma-AlO film formation on single crystalline beta-NiAl (110)
Zhongfan Zhang, Keeyoung Jung, Long Li, and Judith C. Yang
The growth kinetics and mechanisms of thermally-grown thin gamma-AlO film at 650 degrees C in air on single-crystalline beta-NiAl (110) was characterized via transmission electron microscopy, X-ray diffractometry, and thermo-gravimetric analyses. The oxidation kinetics as a function of thickness wa ... [J. Appl. Phys. 111, 034312 (2012)] published Thu Feb 9, 2012.
Molecular dynamics simulations of damage production by thermal spikes in Ge
Pedro Lopez, Lourdes Pelaz, Ivan Santos, Luis A. Marques, and Maria Aboy
Molecular dynamics simulation techniques are used to analyze damage production in Ge by the thermal spike process and to compare the results to those obtained for Si. As simulation results are sensitive to the choice of the inter-atomic potential, several potentials are compared in terms of material ... [J. Appl. Phys. 111, 033519 (2012)] published Thu Feb 9, 2012.
Prediction of glass-forming ability and characterization of atomic structure of the Co-Ni-Zr metallic glasses by a proposed long range empirical potential
Dai Ye, Li Jiahao, and Liu Baixin
An interatomic potential is constructed for the Co-Ni-Zr ternary metal system under long range empirical formalism and applied to conduct molecular dynamics simulations and Voronoi tessellations. Using solid solution models with varying solute concentrations, the simulations reveal that the physical ... [J. Appl. Phys. 111, 033521 (2012)] published Thu Feb 9, 2012.
Communication: Angle-resolved thermal dissociative sticking of CH on Pt(111): Further indication that rotation is a spectator to the gas-surface reaction dynamics
J. K. Navin, S. B. Donald, D. G. Tinney, G. W. Cushing, and I. Harrison
Effusive molecular beam measurements of angle-resolved thermal dissociative sticking coefficients for CH impinging on a Pt(111) surface, at a temperature of 700 K, are reported and compared to theoretical predictions. The reactivity falls off steeply as the molecular angle of incidence increases awa ... [J. Chem. Phys. 136, 061101 (2012)] published Thu Feb 9, 2012.
Time-resolved simultaneous polarized and depolarized light scattering system with high sensitivity to optical anisotropy: Application to phase separation of an optically isotropic liquid mixture
Takehito Koyama and Hajime Tanaka
Depolarized light scattering is widely used to probe the spatial correlation of optical anisotropy in crystals, liquid crystals, and viscoelastic materials under stress, and a powerful means to study a non-equilibrium pattern evolution process of such a system. To follow the temporal change in the d ... [J. Chem. Phys. 136, 064509 (2012)] published Thu Feb 9, 2012.
Spin-dependent synchrotron x-ray excitations studied by scanning tunneling microscopy
V. Rose, T. Y. Chien, J. W. Freeland, D. Rosenmann, J. Hiller et al.
The ability to position a sharp probe in close proximity to a sample while the surface is illuminated by synchrotron x-rays opens a path to localized spectroscopy and imaging with chemical and magnetic contrast. We have employed a scanning tunneling microscope for the local study of synchrotron x-ra ... [J. Appl. Phys. 111, 07E304 (2012)] published Thu Feb 9, 2012.
The long range voice coil atomic force microscope
H. Barnard, C. Randall, D. Bridges, and P. K. Hansma
Most current atomic force microscopes (AFMs) use piezoelectric ceramics for scan actuation. Piezoelectric ceramics provide precision motion with fast response to applied voltage potential. A drawback to piezoelectric ceramics is their inherently limited ranges. For many samples this is a nonissue, a ... [Rev. Sci. Instrum. 83, 023705 (2012)] published Thu Feb 9, 2012.
Nanostructure thermal conductivity prediction by Monte Carlo sampling of phonon free paths
Alan J. H. McGaughey and Ankit Jain
We propose a method by which the thermal conductivity of a nanostructure with arbitrary geometry can be predicted through Monte Carlo sampling of the free paths associated with phonon-phonon and phonon-boundary scattering. The required inputs are the nanostructure geometry and the bulk phonon freque ... [Appl. Phys. Lett. 100, 061911 (2012)] published Thu Feb 9, 2012.
Single photon emission from InGaN/GaN quantum dots up to 50 K
Stefan Kremling, Christian Tessarek, Heiko Dartsch, Stephan Figge, Sven Hofling et al.
We have investigated the optical properties of single InGaN quantum dots (QDs) by means of microphotoluminescence ([mu]PL) spectroscopy. The QDs were grown on sapphire substrate using metal organic vapor phase epitaxy. Sharp and isolated single exciton emission lines in the blue spectral range were ... [Appl. Phys. Lett. 100, 061115 (2012)] published Thu Feb 9, 2012.
Spontaneous formation of quantum height manganese gallium islands and atomic chains on N-polar gallium nitride(000[overline [bold 1]])
Abhijit Chinchore, Kangkang Wang, Meng Shi, Yinghao Liu, and Arthur R. Smith
Deposition of manganese onto the gallium-rich, nitrogen-polar GaN(000[overline 1]) surface results in the formation of quantum-height island structures. Two unique island heights differing by one atomic layer are observed, including 0.93 nm high islands which are unstable against the formation of 1. ... [Appl. Phys. Lett. 100, 061602 (2012)] published Thu Feb 9, 2012.
Anomaly of film porosity dependence on deposition rate
Stephen P. Stagon, Hanchen Huang, J. Kevin Baldwin, and Amit Misra
This letter reports an anomaly of film porosity dependence on deposition rate during physical vapor deposition the porosity increases as deposition rate decreases. Using glancing angle deposition of Cu on SiO substrate, the authors show that the Cu film consists of well separated nanorods when the ... [Appl. Phys. Lett. 100, 061601 (2012)] published Thu Feb 9, 2012.
Local structure of nitrogen in N-doped amorphous and crystalline GeTe
Alexander V. Kolobov, Paul Fons, Berangere Hyot, Bernard Andre, Junji Tominaga et al.
The local structure around nitrogen species in N-doped GeTe has been investigated using (soft) x-ray absorption spectroscopy and high-resolution x-ray photoemission spectroscopy. The obtained results demonstrate that while in as-deposited amorphous GeTe nitrogen is predominantly bonded to Ge atoms, ... [Appl. Phys. Lett. 100, 061910 (2012)] published Thu Feb 9, 2012.
Persistence of Covalent Bonding in Liquid Silicon Probed by Inelastic X-Ray Scattering
J. T. Okada, P. H.-L. Sit, Y. Watanabe, Y. J. Wang, B. Barbiellini et al.
Metallic liquid silicon at 1787 K is investigated using x-ray Compton scattering. An excellent agreement is found between the measurements and the corresponding Car-Parrinello molecular dynamics simulations. Our results show persistence of covalent bonding in liquid silicon and provide support for t ... [Phys. Rev. Lett. 108, 067402 ] published .
Glass-Transition Temperature Gradient in Nanocomposites: Evidence from Nuclear Magnetic Resonance and Differential Scanning Calorimetry
Aurelie Papon, Helene Montes, Mohamed Hanafi, Francois Lequeux, Laurent Guy et al.
The slowing-down of the dynamics of a polymer chain near a surface has been observed for many years now. Here we show that the behavior of model nanocomposites can be quantitatively described with a gradient of glass-transition temperature. We describe with a single parameterthe range of this gradie ... [Phys. Rev. Lett. 108, 065702 ] published .
Evidence for a Phase Transition in Silicate Melt at Extreme Pressure and Temperature Conditions
D. K. Spaulding, R. S. McWilliams, R. Jeanloz, J. H. Eggert, P. M. Celliers et al.
Laser-driven shock compression experiments reveal the presence of a phase transition in MgSiO over the pressure-temperature range 300400 GPa and 10 00016 000 K, with a positive Clapeyron slope and a volume change of ~6.3 (2.0) percent. The observations are most readily interpreted as an abrupt liqui ... [Phys. Rev. Lett. 108, 065701 ] published .
Frictionless Flow in a Binary Polariton Superfluid
E. Cancellieri, F. M. Marchetti, M. H. Szymanska, D. Sanvitto, and C. Tejedor
We study the properties of a binary microcavity polariton superfluid coherently injected by two lasers at different momenta and energies. The crossover from the supersonic to the subsonic regime, where motion is frictionless, is described by evaluating the linear response of the system to a weak def ... [Phys. Rev. Lett. 108, 065301 ] published .
Physisorption of benzene on a tin dioxide surface: van der Waals interaction
Matti Viitala, Mikael Kuisma, and Tapio T. Rantala
An adsorption study of the benzene molecule on SnO (110) surfaces with the density functional theory is extended to include the van der Waals interaction. We compare adsorption onto two model surfaces of SnO, oxygen rich (stoichiometric) and oxygen poor (reduced), considered as limiting cases of var ... [Phys. Rev. B 85, 085412 ] published .
Carrier confinement in Ge/Si quantum dots grown with an intermediate ultrathin oxide layer
V. Kuryliuk, O. Korotchenkov, and A. Cantarero
We present computational results for strain effects on charge carrier confinement in GeSi quantum dots (QDs) grown on an oxidized Si surface. The strain and free carrier probability density distributions are obtained using the continuum elasticity theory and the effective-mass approximation implemen ... [Phys. Rev. B 85, 075406 ] published .
Exciton binding energies in chalcopyrite semiconductors
Bernard Gil, Didier Felbacq, and Shigefusa F. Chichibu
The optical spectra of Cu-III-VI chalcopyrite compounds display rich excitonic features in the fundamental direct bandgap energy region. The energy structure of excited excitonic states reported in the literature are reexamined using a calculation of the eigenstates of the hydrogenic problem in the ... [Phys. Rev. B 85, 075205 ] published .
Ground-state characterizations of systems predicted to exhibit L1 or L1 crystal structures
Lance J. Nelson, Gus L. W. Hart, and Stefano Curtarolo
Despite their geometric simplicity, the crystal structures L1 (CuPt) and L1 (CdPt) do not appear as ground states experimentally, except in Cu-Pt. We investigate the possibility that these phases are ground states in other binary intermetallic systems, but overlooked experimentally. Via the synergy ... [Phys. Rev. B 85, 054203 ] published .
Binding and structure of tetramers in the scaling limit
M. R. Hadizadeh, M. T. Yamashita, Lauro Tomio, A. Delfino, and T. Frederico
The momentum-space structure of the Faddeev-Yakubovsky (FY) components of weakly bound tetramers is investigated at the unitary limit using a renormalized zero-range two-body interaction. The results, obtained by considering a given trimer level with binding energy B, provide further support to a un ... [Phys. Rev. A 85, 023610 ] published .
Few-body bound-state stability of dipolar molecules in two dimensions
A. G. Volosniev, D. V. Fedorov, A. S. Jensen, and N. T. Zinner
Bound structures among dipolar molecules in multilayers are a topic of great interest in the light of recent experiments that have demonstrated the feasibility of the setup. While it is known that two molecules in two adjacent layers will always bind, larger complexes have only been scarcely address ... [Phys. Rev. A 85, 023609 ] published .
Structural studies of high-K metastable CoPt thin films with long-range order
Fu-Te Yuan, Jen-Hwa Hsu, Yi-Hung Lin, S. N. Hsiao, and H. Y. Lee
The symmetries of CoPt thin films in different phases, including disordered A1, ordered L1, and L1 were examined by making measurements along the (10.1) diffraction rod. The films were deposited by sputtering on MgO(111) substrates at different temperatures (T). The stacking sequence of close-packed ... [J. Appl. Phys. 111, 07A303 (2012)] published Wed Feb 8, 2012.
Effect of intrinsic tensile stress on (001) orientation in L1 FePt thin films on glass substrates
S. N. Hsiao, S. H. Liu, S. K. Chen, F. T. Yuan, and H. Y. Lee
Single-layered FePt thin films were deposited on glass substrates and subsequently annealed at 800 degrees C for various times in a rapid thermal annealing (RTA) furnace. Near-fully-L1-ordered FePt films were obtained after RTA. The accumulation of the intrinsic tensile stress is mainly contributed ... [J. Appl. Phys. 111, 07A702 (2012)] published Wed Feb 8, 2012.
Multiferroic properties of La-doped BiFeCrO prepared by high-pressure synthesis
Feiming Bai, Lei Shi, Huaiwu Zhang, Zhiyong Zhong, Wendan Wang et al.
Undoped BiFeCrO and 10 at. % La-doped BiFeCrO were prepared by a high-pressure solid-state sintering method. The phase structure, electrical, ferroelectric, and magnetic properties have been investigated. It is shown that doping La can increase the resistivity by three orders of magnitude at room te ... [J. Appl. Phys. 111, 07C702 (2012)] published Wed Feb 8, 2012.
Epitaxial FeGa/GaAs structures via electrochemistry for spintronics applications
K. Sai Madhukar Reddy, Mazin M. Maqableh, and Bethanie J. H. Stadler
In this study, thin films of FeGa (a giant magnetostrictive alloy) were grown on single-crystalline n-GaAs (001) and polycrystalline brass substrates via electrochemical synthesis from ferrous and gallium sulfate electrolytes. Extensive structural characterization using microdiffraction, high-resolu ... [J. Appl. Phys. 111, 07E502 (2012)] published Wed Feb 8, 2012.
Sodium-ion conduction in complex hydrides NaAlH and NaAlH
H. Oguchi, M. Matsuo, S. Kuromoto, H. Kuwano, and S. Orimo
We have studied sodium-ion conduction in complex hydrides NaAlH and NaAlH. The electrical conductivities of these complex hydrides were studied using ac impedance measurements at temperatures up to 363 K for NaAlH and 433 K for NaAlH. Nyquist plots obtained by the measurements indicated the sodium-i ... [J. Appl. Phys. 111, 036102 (2012)] published Wed Feb 8, 2012.
Structural properties and spatial ordering in multilayered ZnMgTe/ZnSe type-II quantum dot structures
U. Manna, I. C. Noyan, Q. Zhang, I. F. Salakhutdinov, K. A. Dunn et al.
We report the structural properties and spatial ordering of multilayer ZnMgTe quantum dots (QDs) embedded in ZnSe, where sub-monolayer quantities of Mg were introduced periodically during growth in order to reduce the valence band offset of ZnTe QDs. The periodicity, period dispersion, individual la ... [J. Appl. Phys. 111, 033516 (2012)] published Wed Feb 8, 2012.
Thermal carrier emission and nonradiative recombinations in nonpolar (Al,Ga)N/GaN quantum wells grown on bulk GaN
P. Corfdir, A. Dussaigne, H. Teisseyre, T. Suski, I. Grzegory et al.
We investigate, via time-resolved photoluminescence, the temperature-dependence of charge carrier recombination mechanisms in nonpolar (Al,Ga)N/GaN single quantum wells (QWs) grown via molecular beam epitaxy on the a-facet of bulk GaN crystals. We study the influence of both QW width and barrier Al ... [J. Appl. Phys. 111, 033517 (2012)] published Wed Feb 8, 2012.
Formation of twins in sapphire under shock wave loading: Atomistic simulations
A. Yu. Kuksin and A. V. Yanilkin
This work is devoted to molecular dynamics (MD) simulation of shock-wave loading of sapphire (alpha-AlO). Defect free sapphire and sapphire with the microcrack are considered. Homogeneous nucleation and growth of rhombohedral twins are observed in single crystal alumina. A fast mechanism of plastic ... [J. Appl. Phys. 111, 033513 (2012)] published Wed Feb 8, 2012.
Elucidation of spin echo small angle neutron scattering correlation functions through model studies
Chwen-Yang Shew and Wei-Ren Chen
Several single-modal Debye correlation functions to approximate part of the overall Debey correlation function of liquids are closely examined for elucidating their behavior in the corresponding spin echo small angle neutron scattering (SESANS) correlation functions. We find that the maximum length ... [J. Chem. Phys. 136, 064506 (2012)] published Wed Feb 8, 2012.
Structure and properties of metal-exchanged zeolites studied using gradient-corrected and hybrid functionals. III. Energetics and vibrational spectroscopy of adsorbates
Florian Goltl and Jurgen Hafner
The influence of the exchange-correlation functional (semilocal gradient corrected or hybrid functional) on density-functional studies of the adsorption of CO and NO in Cu- and Co-exchanged chabazite has been investigated, extending the studies of the structural and electronic properties of these ma ... [J. Chem. Phys. 136, 064503 (2012)] published Wed Feb 8, 2012.
Selective probe of the morphology and local vibrations at carbon nanoasperities
Toshihiko Fujimori (藤森&#x 5229;彦), Koki Urita (瓜田&#x 5E78;幾), David Tomanek, Tomonori Ohba (大場&#x 53CB;則), Isamu Moriguchi (森口&#x 52C7;) et al.
We introduce a way to selectively probe local vibration modes at nanostructured asperities such as tips of carbon nanohorns. Our observations benefit from signal amplification in surface-enhanced Raman scattering (SERS) at sites near a silver surface. We observe nanohorn tip vibration modes in the r ... [J. Chem. Phys. 136, 064505 (2012)] published Wed Feb 8, 2012.
Mesoscopic analysis of Gibbs' criterion for sessile nanodroplets on trapezoidal substrates
F. Dutka, M. Napiorkowski, and S. Dietrich
By taking into account precursor films accompanying nanodroplets on trapezoidal substrates we show that on a mesoscopic level of description one does not observe the phenomenon of liquid-gas-substrate contact line pinning at substrate edges. This phenomenon is present in a macroscopic description an ... [J. Chem. Phys. 136, 064702 (2012)] published Wed Feb 8, 2012.
The role of structure in the nonlinear mechanics of cross-linked semiflexible polymer networks
Nicholas Agung Kurniawan, Soren Enemark, and Raj Rajagopalan
The microstructural basis of the characteristic nonlinear mechanics of biopolymer networks remains unclear. We present a 3D network model of realistic, cross-linked semiflexible fibers to study strain-stiffening and the effect of fiber volume-occupancy. We identify two structural parameters, namely, ... [J. Chem. Phys. 136, 065101 (2012)] published Wed Feb 8, 2012.
A first-principles density functional theory study of the electronic structural and thermodynamic properties of MZrO and MCO (M = Na, K) and their capabilities for CO capture
Yuhua Duan
Alkali metal zirconates could be used as solid sorbents for CO capture. The structural, electronic, and phonon properties of NaZrO, KZrO, NaCO, and KCO are investigated by combining the density functional theory with lattice phonon dynamics. The thermodynamics of CO absorption/desorption reactions o ... [J. Renewable Sustainable Energy 4, 013109 (2012)] published Wed Feb 8, 2012.
Insulation and diffusion barrier characteristics of spin-on-glass layer on a stainless steel substrate
Ming-Jer Jeng, Wei-Jer Lai, Bai-Zong Chang, and Sung-Cheng Hu
The efficiency of CIGS (Copper Indium Gallium diSelenide) solar cells fabricated on stainless steel foil is lower than that on soda-lime glass substrates due to the lack of sodium incorporation and metal impurity diffusion. A dielectric barrier is necessary to prevent metal impurity diffusion for st ... [J. Renewable Sustainable Energy 4, 011603 (2012)] published Wed Feb 8, 2012.
Coexistence of bi-stable memory and mono-stable threshold resistance switching phenomena in amorphous NbO films
Jieun Bae, Inrok Hwang, Yuhyun Jeong, Sung-Oong Kang, Sahwan Hong et al.
Both bi-stable memory and mono-stable threshold switching are observed in amorphous NbO films. In addition, the transition between memory and threshold switching can be induced by changing external electrical stress. Raman spectroscopy and transmission electron microscope data show that the NbO film ... [Appl. Phys. Lett. 100, 062902 (2012)] published Wed Feb 8, 2012.
Spectral reflectance switching of colloidal photonic crystal structure composed of positively charged TiO nanoparticles
HongShik Shim, Joohyun Lim, Chang Gyun Shin, Seog-Jin Jeon, Moon Gyu Han et al.
We report the tunable photonic crystal behavior of highly concentrated, mildly charged TiO nanoparticle colloids under external electric field. Reflectance intensity change at the certain photonic bandgap and its irreversible switching characteristics are observed and discussed. Through computer aid ... [Appl. Phys. Lett. 100, 063113 (2012)] published Wed Feb 8, 2012.
High-pressure phases of NaAlH from first principles
Xiang-Feng Zhou (周向锋), Xiao Dong (董校), Zhisheng Zhao (赵智胜), Artem R. Oganov, Yongjun Tian (田永君) et al.
High-pressure phases of NaAlH are predicted using the ab initio evolutionary algorithm. our first-principles calculations reveal that the low-pressure I4/a phase containing AlH tetrahedra transforms into the monoclinic P2/c phase at 3.8 GPa and then into the orthorhombic Ima2 phase at 20.5 GPa. The ... [Appl. Phys. Lett. 100, 061905 (2012)] published Wed Feb 8, 2012.
Effect of surface plasmon energy matching on the sensing capability of metallic nano-hole arrays
Mohamadreza Najiminaini, Fartash Vasefi, Bozena Kaminska, and Jeffrey J. L. Carson
We report on a nano-hole array structure with a single cavity beneath the perforated gold film. Structures were fabricated with a variety of cavity depths. The optical resonance of each structure as well as the surface plasmon (SP) energy matching between the top and bottom of the gold film were inv ... [Appl. Phys. Lett. 100, 063110 (2012)] published Wed Feb 8, 2012.
Twin structures of epitaxial SnO films grown on a-cut sapphire by metalorganic chemical vapor deposition
Zhen Zhu, Jin Ma, Caina Luan, Wei Mi, and Yu Lv
SnO films have been grown on a-cut (11[overline 2]0) sapphire substrates by metalorganic chemical vapor deposition. X-ray diffraction and transmission electron microscopy were employed to characterize the epitaxial relationship and film structure. The films were (101) oriented with pure rutile struc ... [J. Vac. Sci. Technol. A 30, 021503 (2012)] published Wed Feb 8, 2012.
Weak Exciton Scattering in Molecular Nanotubes Revealed by Double-Quantum Two-Dimensional Electronic Spectroscopy
Darius Abramavicius, Alexandra Nemeth, Franz Milota, Jaroslaw Sperling, Shaul Mukamel et al.
The two-exciton manifold of a double-wall cylindrical molecular aggregate is studied using a coherent third order optical technique. Experiments reveal the anharmonic character of the exciton bands. Atomistic simulations of the exciton-exciton scattering show that the excitons can be treated as weak ... [Phys. Rev. Lett. 108, 067401 ] published .
Crystal Structure of Cold Compressed Graphite
Maximilian Amsler, Jose A. Flores-Livas, Lauri Lehtovaara, Felix Balima, S. Alireza Ghasemi et al.
Through a systematic structural search we found an allotrope of carbon with Cmmm symmetry which we predict to be more stable than graphite for pressures above 10 GPa. This material, which we refer to as Z-carbon, is formed by pure sp bonds and it provides an explanation to several features in experi ... [Phys. Rev. Lett. 108, 065501 ] published .
Effect of alcohol on single-bubble sonoluminescence
Weicheng Cui, Shuibao Qi, Weizhong Chen, Chao Zhou, and Juan Tu
The driving parametric regions in frequency-amplitude space and the optimal parameters for single-bubble sonoluminescence (SBSL) in alcohol aqueous solutions are studied systematically by taking measurements of the spectrum and bubble dynamics. The experimental results show that with an increase in ... [Phys. Rev. E 85, 026304 ] published .
Threshold of hierarchical percolating systems
Jiantong Li, Biswajit Ray, Muhammad A. Alam, and Mikael Ostling
Many modern nanostructured materials and doped polymers are morphologically too complex to be interpreted by classical percolation theory. Here, we develop the concept of a hierarchical percolating (percolation-within-percolation) system to describe such complex materials and illustrate how to gener ... [Phys. Rev. E 85, 021109 ] published .
Interwall screening and excitons in double-wall carbon nanotubes
Yuh Tomio, Hidekatsu Suzuura, and Tsuneya Ando
Exciton properties of double-wall carbon nanotubes are studied in the static screened Hartree-Fock approximation within a kp scheme. The intrawall electron-hole interaction is largely suppressed by interwall screening effects. The suppression is sensitive to the effective interwall distance between ... [Phys. Rev. B 85, 085411 ] published .
Lattice instability and elastic dispersion due to the rattling motion in the type-I clathrate BaGaSn
Isao Ishii, Yasuhiko Suetomi, Takahiro K. Fujita, Koichiro Suekuni, Tomoo Tanaka et al.
To investigate the off-center rattling motion and its charge-carrier dependence in type-I clathrate compounds, we carried out ultrasonic measurements on type-I BaGaSn and a reference compound, KGaSn. We found elastic softening of C originating from a lattice instability due to the off-center rattlin ... [Phys. Rev. B 85, 085101 ] published .
Number of observable features in the acoustic Raman spectra of nanocrystals
Lucien Saviot, Nicolas Combe, and Adnen Mlayah
Low-frequency Raman-scattering spectra are presented for gold nanocrystals with diameters 3.5 and 13 nm. The frequencies of the Raman peaks but also their number are shown to vary with the nanocrystal size. These results are analyzed using both the continuous elastic medium approximation and an atom ... [Phys. Rev. B 85, 075405 ] published .
Hole depletion of ladders in SrCuO induced by correlation effects
V. Ilakovac, C. Gougoussis, M. Calandra, N. B. Brookes, V. Bisogni et al.
The hole distribution in SrCuO is studied by low-temperature polarization-dependent O K near-edge x-ray absorption fine-structure measurements and state-of-the-art electronic structure calculations that include core-hole and correlation effects in a mean-field approach. Contrary to all previous anal ... [Phys. Rev. B 85, 075108 ] published .
Shear modulus of an elastic solid under external pressure as a function of temperature: The case of helium
Felipe Barra, Fernando Lund, Nicolas Mujica, and Sergio Rica
The energy of a dislocation loop in a continuum elastic solid under pressure is considered within the framework of classical mechanics. For a circular loop, this is a function with a maximum at pressures that are well within reach of experimental conditions for solid helium, suggesting, in this case ... [Phys. Rev. B 85, 064103 ] published .
Structure of a 2 (010) Cu twist boundary interface and the segregation of vacancies and He atoms
Enrique Martinez, John P. Hirth, Michael Nastasi, and Alfredo Caro
A 2 (010) Cu twist boundary is characterized by two sets of (1/2) screw dislocations crossing at misfit dislocation intersections (MDIs). Molecular dynamics simulations show that between MDIs, dislocations split into the two possible {111} planes that share the direction, forming a constriction whe ... [Phys. Rev. B 85, 060101 ] published .
First-principles calculation of phase equilibrium of V-Nb, V-Ta, and Nb-Ta alloys
C. Ravi, B. K. Panigrahi, M. C. Valsakumar, and Axel van de Walle
In this paper, we report the calculated phase diagrams of V-Nb, V-Ta, and Nb-Ta alloys computed by combining the total energies of 4050 configurations for each system (obtained using density functional theory) with the cluster expansion and Monte Carlo techniques. For V-Nb alloys, the phase diagram ... [Phys. Rev. B 85, 054202 ] published .
Fermi polarons in two dimensions
Richard Schmidt, Tilman Enss, Ville Pietila, and Eugene Demler
We theoretically analyze inverse radio-frequency (rf) spectroscopy experiments in two-component Fermi gases. We consider a small number of impurity atoms interacting strongly with a bath of majority atoms. In two-dimensional geometries we find that the main features of the rf spectrum correspond to ... [Phys. Rev. A 85, 021602 ] published .
ZnO/Si arrays decorated by Au nanoparticles for surface-enhanced Raman scattering study
Yu Fei Chan, Hai Jun Xu, Lei Cao, Ying Tang, De Yao Li et al.
Large scale and highly ordered flowerlike ZnO/Si nanostructures are successfully prepared by combining two common techniques, viz. hydrothermally etch fabrication of nanoporous Si pillar array (NSPA) and self-catalytic chemical vapor transport growth of ZnO nanowires. Au nanoparticles are decorated ... [J. Appl. Phys. 111, 033104 (2012)] published Tue Feb 7, 2012.
Mixed self-assembled monolayer of molecules with dipolar and acceptor characterInfluence on hysteresis and threshold voltage in organic thin-film transistors
Abdesselam Jedaa, Michael Salinas, Christof M. Jager, Timothy Clark, Alexander Ebel et al.
In this report, we investigate the impact of the molecular dipole moment and redox active head groups (C) in pure and mixed self-assembled monolayers (SAMs), which serve as an ultra-thin hybrid dielectric layer in low-voltage operating organic thin-film transistors. We show that the dipole of the SA ... [Appl. Phys. Lett. 100, 063302 (2012)] published Tue Feb 7, 2012.
Parabolic polarization splitting of Tamm states in a metal-organic microcavity
R. Bruckner, M. Sudzius, S. I. Hintschich, H. Frob, V. G. Lyssenko et al.
We observe hybrid states of cavity photons and Tamm plasmons in an organic microcavity with an incorporated thin silver layer of increasing thickness up to 40 nm. Via [mu]-photoluminescence spectroscopy, we investigate their angular dependence. At oblique angles, we observe a TE-TM polarization spli ... [Appl. Phys. Lett. 100, 062101 (2012)] published Tue Feb 7, 2012.
Sub-250 nm room-temperature optical gain from AlGaN/AlN multiple quantum wells with strong band-structure potential fluctuations
Emanuele Francesco Pecora, Wei Zhang, A. Yu. Nikiforov, Lin Zhou, David J. Smith et al.
Deep-UV optical gain has been demonstrated in AlGaN/AlN multiple quantum wells under femtosecond optical pumping. Samples were grown by molecular beam epitaxy under a growth mode that introduces band structure potential fluctuations and high-density nanocluster-like features within the AlGaN wells. ... [Appl. Phys. Lett. 100, 061111 (2012)] published Tue Feb 7, 2012.
Normalization schemes for ultrafast x-ray diffraction using a table-top laser-driven plasma source
D. Schick, A. Bojahr, M. Herzog, C. von Korff Schmising, R. Shayduk et al.
We present an experimental setup of a laser-driven x-ray plasma source for femtosecond x-ray diffraction. Different normalization schemes accounting for x-ray source intensity fluctuations are discussed in detail. We apply these schemes to measure the temporal evolution of Bragg peak intensities of ... [Rev. Sci. Instrum. 83, 025104 (2012)] published Tue Feb 7, 2012.
Search for a small hole in a cavity wall by intermittent bulk and surface diffusion
Alexander M. Berezhkovskii and Alexander V. Barzykin
We study the search of a small round hole in the wall of a spherical cavity by a diffusing particle, which can reversibly bind to the cavity wall and diffuse on the surface being in the bound state. There are two channels for the particle first passage to the hole, through the bulk, and through the ... [J. Chem. Phys. 136, 054115 (2012)] published Tue Feb 7, 2012.
Publisher's Note: Random sequential adsorption of partially oriented linear k-mers on a square lattice [Phys. Rev. E 84, 061603 (2011)]
Nikolai I. Lebovka, Natalia N. Karmazina, Yuri Yu. Tarasevich, and Valeri V. Laptev
Abstract not available. [Phys. Rev. E 85, 029902 ] published .
Semiconductor qubits based on fluorine implanted ZnMgSe/ZnSe quantum-well nanostructures
Y. M. Kim, D. Sleiter, K. Sanaka, Y. Yamamoto, J. Meijer et al.
It has been shown that the excitons bound to individual donors in epitaxially grown ZnMgSe/ZnSe quantum-well (QW) nanostructures provide suitable single-photon sources and optically controllable qubits for quantum information technology. Here we demonstrate ion implantation as an alternative fluorin ... [Phys. Rev. B 85, 085302 ] published .
Exciton acoustic-phonon coupling in single GaN/AlN quantum dots
Irina A. Ostapenko, Gerald Honig, Sven Rodt, Andrei Schliwa, Axel Hoffmann et al.
Coupling of acoustic phonons to excitons in single wurtzite-type GaN/AlN quantum dots is investigated in detail by cathodoluminescence experiments and compared to theory. Numerical simulations of the coupling in the framework of the independent Boson model with realistic wave functions based on 8-ba ... [Phys. Rev. B 85, 081303 ] published .
Capillary condensation, freezing, and melting in silica nanopores: A sorption isotherm and scanning calorimetry study on nitrogen in mesoporous SBA-15
Sebastian T. Moerz, Klaus Knorr, and Patrick Huber
Condensation, melting, and freezing of nitrogen in a powder of mesoporous silica grains (SBA-15) has been studied by combined volumetric sorption isotherm and scanning calorimetry measurements. Within the mean-field model of Saam and Cole for vapor condensation in cylindrical pores, a liquid nitroge ... [Phys. Rev. B 85, 075403 ] published .
Ionization of coherent excitons by strong terahertz fields
B. Ewers, N. S. Koster, R. Woscholski, M. Koch, S. Chatterjee et al.
The interaction of coherent excitons with intense, single-cycle terahertz (THz) pulses is investigated. A significant bleaching of the 1s-exciton resonance develops into a splitting of the absorption peak and the emergence of pronounced wings with increasing THz field strength. A quantum-mechanical ... [Phys. Rev. B 85, 075307 ] published .
Anisotropic surface coupling while sliding on dolomite and calcite crystals
Carlos M. Pina, Rodolfo Miranda, and Enrico Gnecco
High-resolution friction force microscopy has been performed on the (104) surfaces of dolomite and calcite in deionized water. The two rows of oxygen atoms alternating in a zigzag way on top of both surfaces are resolved with similar contrast while scanning along the [42[overline 1]] direction. Alon ... [Phys. Rev. B 85, 073402 ] published .
Size-induced melting and reentrant freezing in fullerene-doped helium clusters
F. Calvo
The structural and dynamical stabilities of CHe clusters are theoretically investigated using global optimization and path-integral simulation methods. Up to N=32, the fullerene ion traps the helium atoms onto sixfold and fivefold faces, strongly enough to negate vibrational delocalization. Above th ... [Phys. Rev. B 85, 060502 ] published .
Publisher's Note: Infrared optical response of LuFeO under dc electric field [Phys. Rev. B 85, 014303 (2012)]
Chul Lee, JooYoun Kim, S. W. Cheong, and E. J. Choi
Abstract not available. [Phys. Rev. B 85, 059902 ] published .
Static compression of LiH to 250 GPa
A. Lazicki, P. Loubeyre, F. Occelli, Russell J. Hemley, and M. Mezouar
The equation of state of LiH was extended to 252 GPa (V/V=32%) at room temperature using x-ray diffraction in diamond-anvil cells. LiH was shown to remain in the the NaCl (B1) structure under these conditions, and the predicted B1-B2 phase transition well known in neighboring alkali halides was not ... [Phys. Rev. B 85, 054103 ] published .
Phase diagram of Landau-Zener phenomena in coupled one-dimensional Bose quantum fluids
Santiago F. Caballero-Benitez and Rosario Paredes
We study stationary and dynamical properties of the many-body Landau-Zener dynamics of a Bose quantum fluid confined in two coupled one-dimensional chains by using a many-body generalization recently reported Chen et al. [Nature Phys. 7, 61 (2011)], within the decoupling approximation and the one-le ... [Phys. Rev. A 85, 023605 ] published .
Na incorporation into Cu(In,Ga)Se thin-film solar cell absorbers deposited on polyimide: Impact on the chemical and electronic surface structure
X. Song, R. Caballero, R. Felix, D. Gerlach, C. A. Kaufmann et al.
Na has deliberately been incorporated into Cu(In,Ga)Se (CIGSe) chalcopyrite thin-film solar cell absorbers deposited on Mo-coated polyimide flexible substrates by adding differently thick layers of NaF in-between CIGSe absorber and Mo back contact. The impact of Na on the chemical and electronic sur ... [J. Appl. Phys. 111, 034903 (2012)] published Mon Feb 6, 2012.