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

McCormack, Gary; Nath, Rejish; Li, Weibin

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.

• Journal Article Type: Article
• Acceptance Date: Dec 11, 2020
• Online Publication Date: Dec 28, 2020
• Publication Date: Dec 28, 2020
• Deposit Date: Dec 21, 2020
• Publicly Available Date: Jan 4, 2021
• Journal: Physical Review A
• Print ISSN: 2469-9926
• Electronic ISSN: 2469-9934
• Publisher: American Physical Society
• Peer Reviewed: Peer Reviewed
• Volume: 102
• Issue: 6
• Article Number: 063329
• DOI: https://doi.org/10.1103/PhysRevA.102.063329
• Public URL: https://nottingham-repository.worktribe.com/output/5172586
• Publisher URL: https://journals.aps.org/pra/abstract/10.1103/PhysRevA.102.063329