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

Year: 2018

Authors: Qu CL., Stringari S.

Autors Affiliation: Univ Trento, INO CNR BEC Ctr, I-38123 Povo, Italy; Univ Trento, Dipartimento Fis, I-38123 Povo, Italy; Univ Colorado, JILA, Boulder, CO 80309 USA; 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

More Information: We thank Ana M. Rey, Murray Holland, and Chuan-Hsun Li for carefully reading the manuscript. This project has received funding from the European Union’s Horizon 2020 research and innovation programme under Grant Agreement No. 641122 QUIC and the Instituto Nazionale di Fisica Nucleare.
KeyWords: Vortex
DOI: 10.1103/PhysRevLett.120.183202

Citations: 16
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