SCL Seminar by Andreas Geissler

Scientific Computing Laboratory seminar will be held on Thursday, 18 August 2016 at 14:00 in the library reading room “Dr. Dragan Popović" of the Institute of Physics Belgrade. The talk entitled

"Tackling the multitude of bosonic quantum phases in Rydberg-dressed optical lattice systems"

will be given by Andreas Geissler (Institute for Theoretical Physics, University of Frankfurt, Germany).

Abstract of the talk:

Our recent results [1] have shown the rich diversity of quantum phases which are induced by the strong correlations inherent to Rydberg-dressed bosonic atoms trapped in optical lattices. While experimental feasibility of the dressing itself has recently been demonstrated for the first time for a small number of particles [2] as well as in a many-body system [3], a better understanding of the crystallisation dynamics induced by a Rydberg dressing is still required. We have analysed Rydberg-dressed lattice systems for various lattice geometries by applying the real-space extension of bosonic dynamical mean-field theory (RB-DMFT). These results serve as a benchmark for Gutzwiller-type mean-field calculations, where dissipative dynamics can be simulated within the Lindblad master equation approach. We take into account both the spontaneous decay of Rydberg states and effective dephasing due to black-body radiation. We can thus observe dissipative crystallisation dynamics and the stability of crystalline and supersolid order. We additionally investigate quasiparticle excitations of the many-body system, which we determine from linearised Gutzwiller equations.

[1] A. Geissler, I. Vasić, and W. Hofstetter, arXiv:1509.06292 (2015).
[2] Y.-Y. Jau et al., Nat. Phys. 12, 71 (2016).
[3] J. Zeiher et al., arXiv:1602.06313 (2016).