Density functionals

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Interview with Renata Wentzcovitch, professor of Applied Physics and Applied Mathematics and Earth and Environmental Sciences at Columbia University. Wentzcovitch recounts her childhood in Brazil, and she describes how her grandfather sparked her interest in science early on. She describes her education at the University of São Paulo’s Institute of Physics where she developed an interest in density functional theory. Wentzcovitch discusses her interest in pursuing a graduate degree in the United States, and her decision to attend UC Berkeley and study under the direction of Marvin Cohen. She describes her thesis research on pseudopotential plane-wave codes and super-hard materials such as boron nitride and diamonds. Wentzcovitch explains the impact of High Tc Superconductivity on both her career and the field generally, and she describes her postdoctoral research with joint appointments at Brookhaven and Stony Brook on evolving electronic wavefunctions via classical dynamics. She discusses her subsequent work with Volker Henie at Cambridge to study silicate perovskite, which in turn led to her first faculty appointment at the University of Minnesota. Wentzcovitch describes the importance of Minnesota’s Supercomputing Institute for her research, and she explains how her research focused more centrally on geophysics and the thermo-elasticity of minerals and their aggregates. She describes the founding of the Virtual Laboratory for Earth and Planetary Materials and explains her decision to join the faculty at Columbia and her involvement with VLab and the study of exchange-correlation functionals to address electronic interactions. At the end of the interview, Wentzcovitch discusses her current work on developing codes for thermodynamic computations and seismic tomography, and she conveys the value of pursuing international collaborations to fit her broad and diverse research agenda.

Interview with Lu Sham, Distinguished Professor of Physics Emeritus, University of California at San Diego. Sham recounts his childhood in Hong Kong and he describes the legacy of Japanese rule from World War II. He describes his early interests in math and he explains his decision to pursue a higher education in England at Imperial College. Sham discusses his motivation to conduct graduate work at Cambridge University and to study under Nevill Mott on the first principle method calculating the electron contribution to lattice vibration. He describes the help provided by John Ziman to secure his postdoctoral position at UC San Diego to work with Walter Kohn, and he describes the foundational collaboration and research that went into the Kohn-Sham equation and how this work builds on the classic debate between Einstein and Bohr. He describes the opportunities leading to his faculty appointment and eventual tenure on the physics faculty, and he explains the benefits of spending summers doing research at Bell Labs. Sham discusses his contributions to research on semiconductors, quantum computing, and density-functional theory. He describes his more recent interest in optics and the formative work he has done with graduate students and postdoctoral researchers over the years. Sham discusses his administrative service as department chair and Dean of Science. At the end of the interview, Sham asserts that the future of condensed matter physics holds limitless possibilities, and that improvements in semiconductor materials will push quantum information abilities in exciting and unforeseen directions.