CMT seminar: Extension of dual-fermion method to systems with disorder
Wednesday, April 4, 2012 – 3:00pm – 4:30pm
Department of Physics, LSU
We have extended the recently developed dual fermion approach  to study systems with disorder. In particular, we consider the effect of non-local disorder-induced correlations in the non-interacting tight-binding model with a diagonal disorder. Within this method, such effects are included in a systematic way as an expansion to the coherent potential approximation (CPA). Our disorder dual-fermion method provides an alternative way to go beyond CPA treatment of the system. The ability to properly consider the non-local disorder correlations and provide corrections to the CPA, is indeed crucial for the description of the electron localization.
 A. N. Rubtsov, M. I. Katsnelson, and A. I. Lichtenstein, Phys. Rev. B 77, 033101 (2008).
Host: Jim Freericks