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TT: Fachverband Tiefe Temperaturen

TT 12: CE: Metal-Insulator Transition 1

TT 12.2: Vortrag

Dienstag, 23. März 2010, 09:45–10:00, H19

Efficient treatment of frequency dependent interactions in DMFT — •Philipp Werner¹ and Andrew Millis² — ¹Theoretische Physik, ETH Zurich, 8093 Zurich — ²Department of Physics, Columbia University, New York 10027

First principles calculations of screened Coulomb interaction parameters lead in some materials to a strongly frequency dependent U(ω) [1]. The recently developed diagrammatic impurity solvers [2,3] enable a very efficient treatment of the resulting retarded interactions within the framework of dynamical mean field theory (DMFT). I will explain the main algorithmic ideas in the context of a DMFT simulation of the Holstein-Hubbard model [4] and show how this method can be adapted to models with arbitrary U(ω).

[1] F. Aryasetiawan, M. Imada, A. Georges, G. Kotliar, S. Biermann, and A. I. Lichtenstein, Phys. Rev. B 70, 195104 (2004).

[2] A. N. Rubtsov, V. V. Savkin, A. I. Lichtenstein, Phys. Rev. B 72 035122 (2005).

[3] P. Werner, A. Comanac, L. De Medici, M. Troyer, and A. J. Millis, Phys. Rev. Lett. 97, 076405 (2006).

[4] P. Werner and A. J. Millis, Phys. Rev. Lett. 99, 146404 (2007).