Angular Momentum of a Bose-Einstein Condensate in a Synthetic Rotational Field

Year: 2018

Authors: Qu CL., Stringari S.

Autors Affiliation: [Qu, Chunlei; Stringari, Sandro] INO CNR BEC Ctr, I-38123 Povo, Italy and Univ Trento, Dipartimento Fis, I-38123 Povo, Italy.
[Qu, Chunlei] Univ Colorado, JILA, Boulder, CO 80309 USA and Univ Colorado, Dept Phys, Boulder, CO 80309 USA.

Abstract: By applying a position-dependent detuning to a spin-orbit-coupled Hamiltonian with equal Rashba and Dresselhaus coupling, we exploit the behavior of the angular momentum of a harmonically trapped Bose-Einstein condensed atomic gas and discuss the distinctive role of its canonical and spin components. By developing the formalism of spinor hydrodynamics, we predict the precession of the dipole oscillation caused by the synthetic rotational field, in analogy with the precession of the Foucault pendulum, the excitation of the scissors mode, following the sudden switching off of the detuning, and the occurrence of Hall-like effects. When the detuning exceeds a critical value, we observe a transition from a vortex free, rigidly rotating quantum gas to a gas containing vortices with negative circulation which results in a significant reduction of the total angular momentum.

Journal/Review: PHYSICAL REVIEW LETTERS

Volume: 120 (18)      Pages from: 183202-1  to: 183202-6

KeyWords: vortex
DOI: 10.1103/PhysRevLett.120.183202

Citations: 13
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