Regensburg 2013 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 63: Focused Session: Dynamical Mean-Field Approach to Correlated Electron Materials (jointly with MA)

TT 63.4: Invited Talk

Thursday, March 14, 2013, 16:45–17:15, H20

Dynamical Mean Field Theory of Collective Excitations — •Alexander Lichtenstein — University of Hamburg, Hamburg, Germany

Dynamical mean field theory (DMFT) in combination with the first-principle scheme is an optimal starting point to go beyond static density functional approximation and include effects of local spin, orbital and charge fluctuations. In order to investigate collective non-local excitations we formulate a general framework which start from the DMFT solution for strongly correlated materials within a numerically exact continuous-time Quantum Monte Carlo impurity solver[1] and use a dual-particle transformation in the path integral formalism to find an optimal diagrammatic series for the lattice Green functions.
[1] E. Gull, A.J. Millis, A.I. Lichtenstein, A.N. Rubtsov, M. Troyer, and Ph. Werner, Rev. Mod. Phys. 83, 349 (2011)