• Letter

Quantum droplet of a two-component Bose gas in an optical lattice near the Mott insulator transition

Yoshihiro Machida, Ippei Danshita, Daisuke Yamamoto, and Kenichi Kasamatsu
Phys. Rev. A 105, L031301 – Published 2 March 2022
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Abstract

We theoretically study dynamical formation of a quantum droplet in a two-component Bose-Hubbard system with an external trap potential. Specifically, the superfluid in the central region surrounded by the Mott insulator with double filling forms a quantum droplet, which is self-bound thanks to the discontinuous nature of the quantum phase transition between the two phases. We show how to induce the characteristic behavior of the droplet through the control of the trap potential by using the time-dependent Gutzwiller simulations in a two-dimensional system. The static and dynamical properties of the droplet can be described qualitatively by the effective Ginzburg-Landau field theory with cubic-quintic nonlinearities where the attractive cubic nonlinearity emerges, although all the bare interparticle interactions are repulsive.

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  • Received 28 September 2021
  • Revised 6 December 2021
  • Accepted 31 January 2022

DOI:https://doi.org/10.1103/PhysRevA.105.L031301

©2022 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

Yoshihiro Machida1, Ippei Danshita1, Daisuke Yamamoto2, and Kenichi Kasamatsu1

  • 1Department of Physics, Kindai University, Higashi-Osaka, Osaka 577-8502, Japan
  • 2Department of Physics, Nihon University, Sakurajosui, Setagaya, Tokyo 156-8550, Japan

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Issue

Vol. 105, Iss. 3 — March 2022

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