Hannover 2016 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 48: Ultra-cold atoms, ions and BEC III (with A)

Q 48.5: Vortrag

Donnerstag, 3. März 2016, 12:00–12:15, f107

Dynamics of strongly correlated fermions—first principle results for two and three dimensions — •Niclas Schlünzen, Sebastian Hermanns, Jan-Philip Joost, and Michael Bonitz — CAU Kiel, Germany

Quantum transport of strongly correlated fermions is of central interest in condensed matter physics. While the stationary expansion dynamics have recently been measured with cold atoms in two-dimensional (2D) optical lattices [1], ab initio simulations have been limited, so far, to 1D setups. Using the nonequilibrium Green functions method with the T-matrix approximation [2,3], it becomes possible to precisely predict the fermionic quantum dynamics for 2D and 3D [4]. The simulations give access to the short-time dynamics, including the spatially resolved build-up of correlations, as well as the long-time limit of the expansion. The latter is investigated concerning the differences between 1D, 2D and 3D and the dependence of the expansion velocity on the particle number N, for which a universal scaling is discovered. These predictions can be verified experimentally using the recently developed fermionic atom microscopes.
  [1] U. Schneider et al., Nat. Phys. 8, 213 (2012)
  [2] K. Balzer and M. Bonitz, NEGF Approach to Inhomogeneous Systems, Lecture Notes in Physics (Springer, 2013)
  [3] M. P. von Friesen et al., Phys. Rev. B 82, 155108 (2010)
  [4] ngermanN. Schlünzen, S. Hermanns, M. Bonitz, and C. Verdozzi, arXiv:1508.02947 (2015)