Ph. D. E. E., Stanford University , 1986.
Postdoctoral Scientist, IBM T. J. Watson Research Center, Yorktown Heights, New York (1986-1988).
Senior Member of Research Staff, Philips Laboratories, Briarcliff Manor, New York (1988-1991).
Adjunct Professor, Columbia University, New York (1991).
Principal Scientist/Senior Member/Member of Research Staff, Xerox Palo Alto Research Center ( PARC ), Palo Alto, California (1991- 2004 ).
Alexander von Humboldt US Senior Scientist at the Fritz-Haber- Institut and the Paul- Drude - Institut, Berlin, Germany (May-October 1999).
Professor, Materials Department, University of California, Santa Barbara (2004 -).
Herbert Kroemer Chair in Materials Science, University of California, Santa Barbara (2013 -).
Distinguished Professor, Materials Department, University of California, Santa Barbara (2015 -).
APS Division of Computational Physics: Vice-Chair, 2015-2016; Chair-Elect, 2016-2017; Chair, 2017-2018.
Member of the Editorial Board, Physical Review Letters, 1996-1999
Associate Editor, Journal of Electronic Materials, 2011-2014.
IUPAP C8 Commission on Semiconductors, Vice-chair, 2005-2008; Member, 2008-2011
US National Liaison Committee, National Research Council, 2005-2011
Scientific Advisory Board, Paul Drude Institute, Berlin, Germany, 2002-2009
Solid State Sciences Committee, Board on Physics and Astronomy, National Academies, 2003-2006
Publications and Presentations
Over 500 scientific publications.
Publication list (Google Scholar, ORCID).
24 U.S. patents; several patents pending.
Over 230 Invited and Plenary Presentations at International Conferences and Schools. Numerous invited seminars at universities and industrial or government laboratories.
Web of Science [March 2022]: h index: 107, Over 51,000 citations. 8 publications with over 1000 citations, 111 publications with over 100 citations.
Included in the 2014, 2017, 2018, 2019, 2020, and 2021 “Highly Cited Researchers” lists.
Novel electronic materials; wide-band-gap semiconductors; oxides; two-dimensional materials; spin centers for quantum computing.
Physics and chemistry of hydrogen interactions with solids, liquids, and molecular systems. Hydrogen generation and storage.
Computational physics. Density-functional theory, pseudopotentials. Atomic and electronic structure of crystalline, polycrystalline and amorphous materials, interfaces, surfaces, defects.
Semiconductor heterojunctions and superlattices ; effects of strain; deformation potentials. Metal-semiconductor interfaces, Schottky barriers.
Defects and impurities in solids, doping, diffusion. Hyperfine parameters, vibrational modes.
Device simulations; optical gain in laser structures; loss mechanisms in light emitters.