Nonlinear dynamics of Rydberg-dressed Bose-Einstein condensates in a triple-well potential

Gary McCormack, Rejish Nath, and Weibin Li
Phys. Rev. A 102, 063329 – Published 28 December 2020

Abstract

We study nonlinear dynamics of Rydberg-dressed Bose-Einstein condensates (BECs) trapped in a triple-well potential in the semiclassical limit. The Rydberg-dressed BECs experience a long-range soft-core interaction, giving rise to strong nearest- and next-nearest-neighbor interactions in the triple-well system. Using mean-field Gross-Pitaevskii (GP) equations, we show that lower branches of the eigenspectra exhibit loops and level crossings when the soft-core interaction is strong. The direct level crossings eliminate the possibility of adiabatic Landau-Zener transitions when tilting of the triple-well potential. We demonstrate that the long-range interaction allows for self-trapping in one, two, or three wells, in a far more controllable manor than BECs with short-range or dipolar interactions. Exact quantum simulations of the three-well Bose-Hubbard model indicate that self-trapping and nonadiabatic transition can be observed with less than a dozen bosons. Our study is relevant to current research into collective excitation and nonlinear dynamics of Rydberg-dressed atoms.

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  • Received 23 October 2020
  • Accepted 7 December 2020

DOI:https://doi.org/10.1103/PhysRevA.102.063329

©2020 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied PhysicsAtomic, Molecular & OpticalNonlinear Dynamics

Authors & Affiliations

Gary McCormack1, Rejish Nath2, and Weibin Li1

  • 1School of Physics and Astronomy, and Centre for the Mathematics and Theoretical Physics of Quantum Non-Equilibrium Systems, University of Nottingham, NG7 2RD, United Kingdom
  • 2Indian Institute of Science Education and Research, Pune 411008, India

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Issue

Vol. 102, Iss. 6 — December 2020

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