Energy landscape of silicon systems and its description by force fields, tight binding schemes, density functional methods, and quantum Monte Carlo methods

S. Alireza Ghasemi,1 Maximilian Amsler,1 Richard G. Hennig,2 Shantanu Roy,1 Stefan Goedecker,1,* Thomas J. Lenosky,3 C. J. Umrigar,4 Luigi Genovese,5 Tetsuya Morishita,6 and Kengo Nishio6 1Department of Physics, Universität Basel, Klingelbergstr. 82, 4056 Basel, Switzerland 2Department of Materials Science and Engineering, Cornell University, Ithaca, New York 14850, USA 3C8 Medisensors, Los Gatos, California 95032, USA 4Laboratory of Atomic and Solid State Physics, Cornell University, Ithaca, New York 14853, USA 5European Synchrotron Radiation Facility, 6 rue Horowitz, 38043 Grenoble, France 6Research Institute for Computational Sciences (RICS), National Institute of Advanced Industrial Science and Technology (AIST), 1-1-1 Umezono, Tsukuba, Ibaraki 305-8568, Japan Received 20 October 2009; revised manuscript received 23 April 2010; published 9 June 2010