154-HW6

154-HW6 - OEM154 Nanophotonic Materials Analysis Homework...

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OEM154 Nanophotonic Materials Analysis Homework #6 (due Nov. 10, 2011) 1. In lecture #5,we derive the Thomas-Fermi screening potential, ܸሺܴሻൌܼ ܼ ݁ √ோ ାଷ௔ . Please compare the Thomas-Fermi screening potential with the Coulomb potential, ܸ ሺݎሻൌܼ ܼ ݁ , for r/a = 0.01, 0.1 and 1.0, and for Helium ions incident on silicon. (a is the Thomas- Fermi screening radius given in lecture #4, page 40).
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