Cluster expansion and optimization of thermal conductivity in SiGe nanowires

M. K. Y. Chan,1,2 J. Reed,3 D. Donadio,4 T. Mueller,2 Y. S. Meng,2,5 G. Galli,4 and G. Ceder2 1Department of Physics, Massachusetts Institute of Technology, Cambridge, MA 02139, USA 2Department of Materials Science and Engineering, Massachusetts Institute of Technology, Cambridge, MA 02139, USA 3Lawrence Livermore National Laboratory, Livermore, CA 94551, USA 4Department of Chemistry, University of California, Davis, Davis, CA 95616, USA 5Department of NanoEngineering, University of California, San Diego, La Jolla, CA 92093, USA Received 29 July 2009; revised manuscript received 27 March 2010; published 7 May 2010