Bulletin of the American Physical Society
52nd Annual Meeting of the APS Division of Atomic, Molecular and Optical Physics
Volume 66, Number 6
Monday–Friday, May 31–June 4 2021; Virtual; Time Zone: Central Daylight Time, USA
Session K06: Quantum Phases in Optical Lattices I
10:30 AM–12:18 PM,
Wednesday, June 2, 2021
Chair: Peter Schauss, Virginia
Abstract: K06.00004 : Quantum droplet phases in multimode optical cavities
11:06 AM–11:18 AM
Live
Presenter:
Petr Karpov
Authors:
Petr Karpov
Francesco Piazza
(Max Planck Institute for the Physics of Complex Systems)
We study the system of bosonic atoms in a multimode optical cavity, which can be modeled by an extended Bose-Hubbard model with competing on-site repulsive and finite-range (cavity-mediated) attractive interactions. We use the canonical worm Quantum Monte Carlo algorithm to explore the phase diagram of the model. Our approach is numerically exact and goes beyond the standard Gross-Pitaevskii analysis allowing us to study both superfluid and Mott phases. Moreover, since we explicitly work in the canonical ensemble, we don't have to fine-tune the chemical potential and can deal with arbitrary occupation numbers (up to the total number of particles in the system).
I will show that in addition to the previously studied density-wave and supersolid self-organized superradiant phases, the finite-range cavity-mediated attraction can lead to the formation of quantum self-bound droplets. The droplet phases dominate the phase diagram and can include both compressible superfluid/supersolid as well as incompressible Mott and density-wave droplets.
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