Pseudodielectric function and critical-point energies of iron pyrite

S. G. Choi,1,* J. Hu,2 L. S. Abdallah,3 M. Limpinsel,4 Y. N. Zhang,2 S. Zollner,3 R. Q. Wu,2 and M. Law4 1National Renewable Energy Laboratory, Golden, Colorado 80401, USA 2Department of Physics and Astronomy, University of California, Irvine, California 92697, USA 3Department of Physics, New Mexico State University, Las Cruces, New Mexico 88003, USA 4Department of Chemistry, University of California, Irvine, California 92697, USA (Received 26 May 2012; revised manuscript received 23 August 2012; published 12 September 2012)