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Q: Fachverband Quantenoptik und Photonik

Q 13: Ultra-cold atoms, ions, and BEC (joint session A/Q)

Q 13.14: Poster

Mittwoch, 22. September 2021, 16:30–18:30, P

Quantum droplet phases in extended Bose-Hubbard models with cavity-mediated interactions — •Peter Karpov^1,2 and Francesco Piazza¹ — ¹Max Planck Institute for the Physics of Complex Systems, Dresden, Germany — ²National University of Science and Technology “MISiS”, Moscow, Russia

Extended Bose-Hubbard (eBH) models have been studied for more than 30 years. We numerically found a set of new phases present in generic eBH models with competing long-range attractive and local repulsive interactions [1]. These are different phases of self-bound quantum droplets. We observe a complex sequence of transitions between droplets of different sizes, and of compressible (superfluid or supersolid) as well as incompressible (Mott or density-wave insulating) nature, governed by the competition between the local repulsion and the finite-range attraction.

We propose a concrete experimental implementation scheme based on the multimode optical cavities. The analogous infinite-range model was experimentally realized by the Zürich group [2] using single-mode optical cavities. The recent progress with multimode optical cavities by the Stanford group [3] makes it possible to realize the eBH model with tunable finite-range sign-changing interactions.

[1] P. Karpov, F. Piazza, arXiv:2106.13226 (2021).

[2] R. Landig et al, Nature 532, 476 (2016).

[3] V. Vaidya et al, Phys. Rev. X 8, 011002 (2018).