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Mott transition in a cavity-boson system: A quantitative comparison between theory and experiment

by Rui Lin, Christoph Georges, Jens Klinder, Paolo Molignini, Miriam Büttner, Axel U. J. Lode, R. Chitra, Andreas Hemmerich, Hans Keßler

Submission summary

As Contributors: Rui Lin
Preprint link: scipost_202104_00032v1
Code repository: http://ultracold.org/
Date submitted: 2021-04-29 14:52
Submitted by: Lin, Rui
Submitted to: SciPost Physics
Academic field: Physics
Specialties:
  • Atomic, Molecular and Optical Physics - Experiment
  • Atomic, Molecular and Optical Physics - Theory
Approaches: Experimental, Computational

Abstract

The competition between short-range and cavity-mediated infinite-range interactions in a cavity-boson system leads to the existence of a superfluid phase and a Mott-insulator phase within the self-organized regime. We quantitatively compare the steady-state phase boundaries of this transition measured in experiments and simulated using the Multiconfigurational Time-Dependent Hartree Method for Indistinguishable Particles. To make the problem computationally viable, we represent the full system by the exact many-body wave function of a two-dimensional four-well potential. We argue that the validity of this representation comes from the nature of both the cavity-atomic system and the Bose-Hubbard physics, and verify that it only induces small systematic errors. The experimentally measured and theoretically predicted phase boundaries agree reasonably. We thus propose a new approach for the quantiative numerical determination of the superfluid--Mott-insulator phase boundary.

Current status:
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Submission scipost_202104_00032v1 on 29 April 2021

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