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Lookup NU author(s): Dr Srivatsa BadariprasadORCiD
This is the final published version of an article that has been published in its final definitive form by American Physical Society, 2020.
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We theoretically investigate a Bose-Einstein condensate confined by a rotating harmonic trap whose rotation axis is not aligned with any of its principal axes. The principal axes of the Thomas-Fermi density profiles of the resulting stationary solutions are found to be tilted with respect to those of the rotating trap, representing an extra degree of freedom that is associated with the existence of additional branches of stationary solutions for any given rotation axis alignment. By linearizing the time-dependent theory about the stationary states, we obtain a semianalytical prediction of their dynamical instability at high rotation frequencies against collective modes arising from environmental perturbations. Comparing the stationary states to direct simulations of the Gross-Pitaevskii equation, we predict the nucleation of quantum vortices in the dynamically unstable rotational regime. These vortex lines are aligned along the rotation axis despite the tilting of the rotating trap although the background density profile is tilted with respect to the trapping and rotation axes.
Author(s): Prasad SB, Mulkerin BC, Martin AM
Publication type: Article
Publication status: Published
Journal: Physical Review A
Year: 2020
Volume: 101
Issue: 6
Online publication date: 04/06/2020
Acceptance date: 11/05/2020
Date deposited: 03/12/2021
ISSN (print): 2469-9926
ISSN (electronic): 2469-9934
Publisher: American Physical Society
URL: https://doi.org/10.1103/PhysRevA.101.063608
DOI: 10.1103/PhysRevA.101.063608
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