Dresden 2014 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 79: Correlated Electrons - Poster Session

TT 79.67: Poster

Mittwoch, 2. April 2014, 15:00–19:00, P2

Thermalization dynamics of finite Hubbard nano-clusters with non-equilibrium Green functions — •Sebastian Hermanns and Michael Bonitz — ITAP, Christian-Albrechts-Universität Kiel, Leibnizstraße 15, 24098 Kiel

The Hubbard model is widely used for the description of narrow-band solid state systems in terms of sites, on which the electrons interact, and hopping amplitudes between these sites. Recently, the Hubbard model has attracted new experimental interest with the ability to perform measurements on only a few ultracold atoms in an optical trap [1]. To describe these processes theoretically, the framework of non-equilibrium Green functions is very well suited, since it provides a controlled way of approximations, is non–perturbative in the exciting field and has shown good results for 1D and 2D Hubbard nano-clusters [2]. In this contribution, we focus on the thermalization dynamics in finite Hubbard systems analyzing the free evolution from strong non-equilibrium initial conditions. We examine the occurence of different relaxation stages and their dependence on the interaction strength, particle number as well as the dimensionality and filling factor.
[1] D. Jaksch et al., Ann. Phys. (N.Y.) 315, 1452 (2005)
[2] M. Bonitz et al., Contrib. Plasma Phys. 53, 778-787 (2013)