Berlin 2015 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 86: Correlated Electrons: (General) Theory 2

TT 86.5: Vortrag

Donnerstag, 19. März 2015, 10:30–10:45, H 3005

Towards high-performance functional renormalization group calculations for interacting fermions — •Julian Lichtenstein1, Stefan A. Maier1, Carsten Honerkamp1,2, Edoardo Di Napoli3, and Daniel Rohe41Institute for Theoretical Solid State Physics, RWTH Aachen University, Germany — 2JARA-FIT, Jülich-Aachen Research Alliance–Fundamentals of Future Information Technology — 3AICES, RWTH Aachen University, Germany — 4Forschungszentrum Juelich GmbH, Juelich, Germany

We show that the flow equations of the singular-mode functional renormalization group (SM-FRG) approach put forward by Wang et al. [1] can be derived from an exchange parametrization of the two-fermion interaction [2] by introducing an additional approximation. Furthermore, we present a new variant of the SM-FRG, in which, unlike in the original variant, the interaction is represented in a unique way. We then discuss the applicability of the approximation made in addition to an exchange parametrization. Finally, we argue that the approximation made facilitates more efficient multiband calculations on a larger number of multi-core CPUs.

[1] Wang et al., Phys. Rev. B 85, 035414 (2012).

[2] C. Husemann and M. Salmhofer, Phys. Rev. B 79, 195125 (2009)

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