Erlangen 2018 – scientific programme
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A: Fachverband Atomphysik
A 15: Ultracold Plasmas and Rydberg Systems II (joint session Q/A)
A 15.3: Talk
Monday, March 5, 2018, 16:45–17:00, K 2.013
Quasi-particle spectra of bosonic Rydberg-dressed many-body phases — •Andreas Geißler1, Yongqiang Li2, Weibin Li3, Ulf Bissbort4, and Walter Hofstetter1 — 1Institut für Theoretische Physik, Johann Woalfgang Goethe-Universität, Frankfurt/Main — 2Department of Physics, National University of Defense Technology, Changsha, China — 3School of Physics and Astronomy, University of Nottingham — 4SUTD, Singapore
As recent experiments have demonstrated the feasibility of Rydberg dressing [1], even in a lattice system [2], the stage is set for realizing (long predicted) exotic states of matter in ultracold gases. Our latest results (simulated in real-space bosonic dynamical mean-field theory RB-DMFT) have shown a rich diversity of crystalline and supersolid quantum phases, both close to resonant driving [3] and in the weak dressing limit [4]. While in the former case we predict a reduction of the Rydberg fraction compared to single atom dressing, we show in the latter case how a two-species mixture can make the realization of a supersolid more accessible. Based on these results we applied a quasi-particle method based on linearized Gutzwiller dynamics (Gqp), to predict various spectral functions for both cases and in an experimentally feasible regime. As RB-DMFT also predicts spectral properties, it serves as a benchmark for Gqp. We furthermore characterize the various observed gapped and ungapped quasi-particle modes.
[1] Y.-Y. Jau et al., Nat. Phys. 12, 71-74 (2016) [2] J. Zeiher et al., Nat. Phys. 12, 1095-1099 (2016) [3] A. Geißler et al., Phys. Rev. A 95, 063608 (2017) [4] Y. Li et al., arXiv:1705.01026