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Ultrafast dynamics of strongly correlated fermions - a Nonequilibrium Green functions approach

Michael Bonitz, Kiel University

14.10.2015 at 15:00 

Motivated by exapnsion dynamics experiments with ultracold fermionic atoms in optical lattices we have developed computer simulations which I will present. They are based on Keldysh Green functions [1]. Strong correlations are describe using T-matrix selfenergies [2]. We are now able to treat more than 100 fermions in any dimension and investigate both the short-time and long-time behavior exactly. Extrapolation to the macroscopic limit allows to compare to the experimental results and reveals a surprisingly good agreement.
[1] K. Balzer, and M. Bonitz, "Nonequilibrium Green's Functions Approach to Inhomogeneous Systems", Lecture Notes in Physics, Springer, vol. 867 (2013)
[2] S. Hermanns, N. Schlünzen, and M. Bonitz, Phys. Rev. B 90, 125111 (2014)
[3] S. Hermanns, N. Schlünzen, M. Bonitz, and C. Verdozzi, arXiv:1508.02957

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