Top-gated germanium nanowire quantum dots in a few-electron regime
Sung-Kwon Shin, Shaoyun Huang, Naoki Fukata, and Koji Ishibashi
Top gated quantum dots (QDs) have been fabricated from n-type chemically synthesized germanium nanowires (GeNWs) by constricting its length with metal electrode contacts. With an intermediate HfO thin film, the constricted GeNW was fully covered by an Omega-shaped top-gate. The QD was probed and cha ... [Appl. Phys. Lett. 100, 073103 (2012)] published Mon Feb 13, 2012.
InGaN/GaN multiple-quantum-well light-emitting diodes grown on Si(111) substrates with ZrB(0001) buffer layers
Adam H. Blake, Derek Caselli, Christopher Durot, Jason Mueller, Eduardo Parra et al.
Multiple-quantum-well light-emitting diode (LED) structures of InGaN/GaN were grown by metalorganic chemical vapor deposition on Si(111) substrates via ZrB(0001) buffer layers and a GaN template comprising composite AlGaN (where x lies in the range from 0 to 1) transition layers to minimize cracking ... [J. Appl. Phys. 111, 033107 (2012)] published Mon Feb 13, 2012.
Relativistic corrections to the semi-inclusive decay of psi and Upsilon
Hai-Ting Chen, Yu-Qi Chen, and Wen-Long Sang
In the framework of the nonrelativistic quantum chromodynamics factorization formalism, we study the processes of psi(nS) and Upsilon(nS) decay into a lepton pair or a charm pair associated with two jets up to the next-to-leading order in velocity expansion. We present the analytic expressions for t ... [Phys. Rev. D 85, 034017 ] published .
Predictions for p + Pb at 4.4A TeV to test initial-state nuclear shadowing at energies available at the CERN Large Hadron Collider
G. G. Barnafoldi, J. Barrette, M. Gyulassy, P. Levai, and V. Topor Pop
Collinear factorized perturbative QCD model predictions are compared for p+Pb at 4.4A TeV to test nuclear shadowing of parton distribution at the CERN Large Hadron Collider (LHC). The nuclear modification factor (NMF), R(y=0,p<20 GeV/c)=dn/[N(b)dn], is computed with an electron-nucleus (e+A) global ... [Phys. Rev. C 85, 024903 ] published .
Tantalum nitride superconducting single-photon detectors with low cut-off energy
A. Engel, A. Aeschbacher, K. Inderbitzin, A. Schilling, K. Il'in et al.
Materials with a small superconducting energy gap are expected to favor a high detection efficiency of low-energy photons in superconducting nanowire single-photon detectors. We developed a TaN detector with smaller gap and lower density of states at the Fermi energy than in comparable NbN devices, ... [Appl. Phys. Lett. 100, 062601 (2012)] published Fri Feb 10, 2012.
Ghost-gluon coupling, power corrections, and Lambda from lattice QCD with a dynamical charm
B. Blossier, Ph. Boucaud, M. Brinet, F. De Soto, X. Du et al.
This paper is a first report on the determination of Lambda from lattice simulations with 2+1+1 twisted-mass dynamical flavors via the computation of the ghost-gluon coupling renormalized in the MOM Taylor scheme. We show this approach allows a very good control of the lattice artefacts and confirm ... [Phys. Rev. D 85, 034503 ] published .
gamma-charge correlation in heavy ion collisions: Various approaches
Prithwish Tribedy, Subhasis Chattopadhyay, and Aihong Tang
Event-by-event gamma-charge (gamma-ch) correlation is studied for systems going through QCD chiral phase transition. In this paper, various methods for measuring gamma-ch correlation in heavy ion collisions are discussed. Dynamical fluctuation due to the formation of domains of disoriented chiral co ... [Phys. Rev. C 85, 024902 ] published .
Higher flow harmonics from (3+1)D event-by-event viscous hydrodynamics
Bjorn Schenke, Sangyong Jeon, and Charles Gale
We present event-by-event viscous hydrodynamic calculations of the anisotropic flow coefficients v to v for heavy-ion collisions at the Relativistic Heavy-Ion Collider (RHIC). We study the dependence of different flow harmonics on shear viscosity and the morphology of the initial state. v and higher ... [Phys. Rev. C 85, 024901 ] published .
On flavor symmetry in lattice quantum chromodynamics
El Hassan Saidi
Using a well established method to engineer non-abelian symmetries in superstring compactifications, we study the link between the point splitting method of Creutz et al. [PoS: Lattice 2010, 078 (2010) and JHEP 041, 1012 (2010)] for implementing flavor symmetry in lattice QCD; and singularity theo ... [J. Math. Phys. 53, 022302 (2012)] published Thu Feb 9, 2012.
Avoidance of Majorana Resonances in Periodic Topological Superconductor-Nanowire Structures
Jay D. Sau, Chien Hung Lin, Hoi-Yin Hui, and S. Das Sarma
Semiconducting nanowires in proximity to superconductors are promising experimental systems for Majorana fermions which may ultimately be used as building blocks for topological quantum computers. A serious challenge in the experimental realization of the Majorana fermion in these semiconductor-supe ... [Phys. Rev. Lett. 108, 067001 ] published .
Confining dyon gas with finite-volume effects under control
Falk Bruckmann, Simon Dinter, Ernst-Michael Ilgenfritz, Benjamin Maier, Michael Muller-Preussker et al.
As an approach to describe the long-range properties of non-Abelian gauge theories at nonzero temperature T
Quantum confinement in Si and Ge nanostructures
E. G. Barbagiovanni, D. J. Lockwood, P. J. Simpson, and L. V. Goncharova
We apply perturbative effective mass theory as a broadly applicable theoretical model for quantum confinement (QC) in all Si and Ge nanostructures including quantum wells (QWs), wires (Q-wires), and dots (QDs). Within the limits of strong, medium, and weak QC, valence and conduction band edge energy ... [J. Appl. Phys. 111, 034307 (2012)] published Wed Feb 8, 2012.
Equation of state of a quasiparticle model at finite chemical potential and quark star
Ya-Lan Tian, Yan Yan, Hua Li, Xin-Lian Luo, and Hong-Shi Zong
In this paper, we employ the equation of state (EOS) of the quasiparticle model proposed in A. M. Zhao et al., Mod. Phys. Lett. A 25, 47 (2010)] which incorporates the effect of vacuum negative pressure to study the properties of quark stars. In our model the EOS has the correct behavior required by ... [Phys. Rev. D 85, 045009 ] published .
Hadron interaction with heavy quarkonia
I. V. Danilkin, V. D. Orlovsky, and Yu. A. Simonov
Dynamics of hadro-quarkonium system is formulated, based on the channel coupling of a light hadron (h) and heavy quarkonium (Q[overline Q]) to intermediate open-flavor heavy-light mesons (Q[overline q], [overline Q]q). The resulting effective interaction is defined by overlap integrals of meson wave ... [Phys. Rev. D 85, 034012 ] published .
High-precision f and heavy quark effective theory from relativistic lattice QCD
C. McNeile, C. T. H. Davies, E. Follana, K. Hornbostel, and G. P. Lepage HPQCD Collaboration
We present a new determination of the B leptonic decay constant from lattice QCD simulations that use gluon configurations from MILC and a highly improved discretization of the relativistic quark action for both valence quarks. Our result, f=0.225(4) GeV, is almost 3 times more accurate than previo ... [Phys. Rev. D 85, 031503 ] published .
Flavor SU(4) breaking between effective couplings
Bruno El-Bennich, Gastao Krein, Lei Chang, Craig D. Roberts, and David J. Wilson
Using a framework in which all elements are constrained by Dyson-Schwinger equation studies in QCD, and therefore incorporate a consistent, direct and simultaneous description of light- and heavy-quarks and the states they constitute, we analyze the accuracy of SU(4)-flavor symmetry relations betwee ... [Phys. Rev. D 85, 031502 ] published .
Highly tunable whispering gallery mode semiconductor lasers with controlled absorber
A. N. Baranov, G. Boissier, R. Teissier, A. M. Monakhov, V. V. Sherstnev et al.
Tunable semiconductor lasers with controlled absorber based on GaInAsSb/GaAlAsSb quantum well heterostructure was fabricated and experimentally studied. The emission wavelength of these lasers shifts from 2.24 to 2.28 [mu]m when the bias on the control contact decreases from the voltage equal to tha ... [Appl. Phys. Lett. 100, 061112 (2012)] published Tue Feb 7, 2012.
Kinematics of deep inelastic scattering in leading order of the covariant approach
Petr Zavada
We study the kinematics of deep inelastic scattering corresponding to the rotationally symmetric distribution of quark momenta in the nucleon rest frame. It is shown that rotational-symmetry together with Lorentz invariance can in leading order impose constraints on the quark intrinsic momenta. Obta ... [Phys. Rev. D 85, 037501 ] published .
Landau gauge gluon and ghost propagators at finite temperature from quenched lattice QCD
R. Aouane, V. G. Bornyakov, E.-M. Ilgenfritz, V. K. Mitrjushkin, M. Muller-Preussker et al.
The behavior of the Landau gauge gluon and ghost propagators is studied in pure SU(3) gauge theory at nonzero temperature on the lattice. We concentrate on the momentum range (0.6, 2.0) GeV. For the longitudinal as well as for the transverse component of the gluon propagator we extract the continuum ... [Phys. Rev. D 85, 034501 ] published .
Time-dependent transport of electrons through a photon cavity
Vidar Gudmundsson, Olafur Jonasson, Chi-Shung Tang, Hsi-Sheng Goan, and Andrei Manolescu
We use a non-Markovian master equation to describe the transport of Coulomb-interacting electrons through an electromagnetic cavity with one quantized photon mode. The central system is a finite-parabolic quantum wire that is coupled weakly to external parabolic quasi-one-dimensional leads at t=0. W ... [Phys. Rev. B 85, 075306 ] published .
Fidelity of fermionic-atom number states subjected to tunneling decay
M. Pons, D. Sokolovski, and A. del Campo
Atom number states are a valuable resource for ultracold chemistry, atom interferometry, and quantum information processing. Recent experiments have achieved their deterministic preparation in trapped few-fermion systems. We analyze the tunneling decay of these states, in terms of both the survival ... [Phys. Rev. A 85, 022107 ] published .