Dynamics of Bose-Einstein recondensation in higher bands

Vaibhav Sharma, Sayan Choudhury, and Erich J. Mueller
Phys. Rev. A 101, 033609 – Published 12 March 2020

Abstract

Motivated by recent experiments, we explore the kinetics of Bose-Einstein condensation in the upper band of a double-well optical lattice. These experiments engineer a nonequilibrium situation in which the highest energy state in the band is macroscopically occupied. The system subsequently relaxes and the condensate moves to the lowest energy state. We model this process, finding that the kinetics occurs in three phases: The condensate first evaporates, forming a highly nonequilibrium gas with no phase coherence; energy is then redistributed among the noncondensed atoms; finally, the atoms recondense. We calculate the timescales for each of these phases and explain how this scenario can be verified through future experiments.

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  • Received 12 November 2019
  • Accepted 20 February 2020

DOI:https://doi.org/10.1103/PhysRevA.101.033609

©2020 American Physical Society

Physics Subject Headings (PhySH)

Atomic, Molecular & OpticalCondensed Matter, Materials & Applied Physics

Authors & Affiliations

Vaibhav Sharma1,*, Sayan Choudhury2,†, and Erich J. Mueller1,‡

  • 1Laboratory of Atomic and Solid State Physics, Cornell University, Ithaca, New York 14853, USA
  • 2Department of Physics and Astronomy, University of Pittsburgh, Pittsburgh, Pennsylvania 15260, USA

  • *vs492@cornell.edu
  • sc2385@cornell.edu
  • em256@cornell.edu

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Vol. 101, Iss. 3 — March 2020

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