Berlin 2015 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 71: Correlated Electrons: Poster Session

TT 71.65: Poster

Mittwoch, 18. März 2015, 15:00–18:00, Poster B

Quench dynamics studied by means of non-equilibrium self-energy-functional theory — •Felix Hofmann1, Martin Eckstein2, and Michael Potthoff11I. Institut für Theoretische Physik, Universität Hamburg — 2Max-Planck-Institut für Struktur und Dynamik der Materie, Universität Hamburg - CFEL

The non-equilibrium self-energy-functional theory (SFT) [1] provides a general framework for the systematic construction of non-perturbative approximations to study strongly correlated systems out of equilibrium. On the space of non-equilibrium self-energies, given on the Keldysh-Matsubara contour, the grand potential can be written as a functional which is stationary at the physical non-equilibrium self-energy. The corresponding variational principle is exploited by restricting the variations to variations of self-energies that are generated by an exactly solvable reference system.

Here we present first results obtained for Hubbard models where the real-time dynamics is induced by a quantum quench of the interaction parameter and using different reference systems. We discuss the details of the numerical implementation, present internal consistency checks, discuss the total energy conservation, and compare with literature data from the non-equilibrium dynamical mean-field theory.

[1] F. Hofmann, M. Eckstein, E. Arrigoni, and M. Potthoff, PRB 88, 165124 (2013)

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