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

Physical Review Letters
Chunlei Qu, Sandro Stringari

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.

References

Oct 4, 2000·Physical Review Letters·K W MadisonJ Dalibard
Dec 4, 2009·Nature·Y-J LinI B Spielman
Mar 4, 2011·Nature·Y-J LinI B Spielman
Jun 16, 2012·Proceedings of the National Academy of Sciences of the United States of America·Lindsay J LeBlancIan B Spielman
Sep 26, 2012·Physical Review Letters·Jin-Yi ZhangJian-Wei Pan
Nov 26, 2014·Reports on Progress in Physics·N GoldmanI B Spielman

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