Regensburg 2016 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 63: Low-Dimensional Systems: 2D - Theory

TT 63.10: Talk

Thursday, March 10, 2016, 12:00–12:15, H21

Frequency-dependent interactions in a two-patch model — •Timo Reckling and Carsten Honerkamp — Institute for Theoretical Solid State Physics, RWTH Aachen University, 52056 Aachen, Germany

We study a two-patch model for interacting fermions with the functional Renormalization Group (fRG). The goal is to gain insight into the frequency dependence of the effective interaction that is generated in the fRG flow. In our model each interaction component g_i depends on three bosonic transfer frequencies or 3 fermionic frequencies that determine the loop contributions on the r.h.s. of the fRG equations. We discuss the applicability of simplified ansatzes like Lorentzians to describe the frequency dependencies. Moreover, we analyze the influence of the frequency dependence on the critical scales of the flows to strong coupling.

This work is supported by the DFG-RTG 1995 "Quantum many-body methods in condensed matter systems".