Bremen 2017 – wissenschaftliches Programm
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P: Fachverband Plasmaphysik
P 22: Theory and Modelling II
P 22.2: Poster
Mittwoch, 15. März 2017, 16:30–18:30, HS Foyer
Nonequilibrium dynamics of correlated fermions: A benchmark analysis of the nonequilibrium Green functions approach — •Niclas Schlünzen1, Jan-Philip Joost1, Fabian Heidrich-Meisner2, and Michael Bonitz1 — 1ITAP, CAU Kiel — 2LMU München
The nonequilibrium dynamics of correlated fermions in lattice systems are of high current interest for condensed matter physics, ultacold atoms and plasma-surface interaction. While there is remarkable progress in experiments (e.g. Ref. [1]), the theoretical description remains challenging, especially in the regime of strong coupling and beyond 1 dimension (1D). Recently, 2D quantum simulations of the expansion of fermions based on nonequilibrium Green functions [2] (NEGF) have been presented [3] that showed excellent agreement with cold atom experiments. We present a benchmark analysis of the NEGF approach compared to results of the numerically accurate density matrix renormalization group (DMRG) method [4], which predominantly has been limited to one dimenional systems. The results indicate that NEGF can compete for weak to intermediate coupling strengths while being easily extendable to higher dimensions, larger system sizes and longer propagation times.
[1] U. Schneider et al., Nat. Phys. 8, 213 (2012)
[2] K. Balzer and M. Bonitz, Lect. Notes Phys. 867 (2013)
[3] N. Schlünzen, S. Hermanns, M. Bonitz, and C. Verdozzi,
Phys. Rev. B 93, 035107 (2016)
[4] N. Schlünzen et al., submitted for publication