I am indebted to Profs. D. Cahill, H. Dai, C. Dames, D. Jena, W. King, J. -P. Leburton, J. Lyding, and U. Ravaioli for many valuable discussions. I also thank Dr. M. -H. Bae for feedback on an earlier manuscript draft. This review was in part supported by the Nanoelectronics Research Initiative (NRI), the DARPA Young Faculty Award (No. HR0011-08-1-0035), the Office of Naval Research (No. N00014-09-1-0180), the National Science Foundation (No. CCF 08-29907), Intel Corp., and Northrop Grumman.
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