Nonequilibrium quantum dynamics of partial symmetry breaking for ultracold bosons in an optical lattice ring trap

A vortex in a Bose-Einstein condensate on a ring undergoes quantum dynamics in response to a quantum quench in terms of partial symmetry breaking from a uniform lattice to a biperiodic one. Neither the current, a macroscopic measure, nor fidelity, a microscopic measure, exhibit critical behavior. In...

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Bibliographic Details
Published in:	New journal of physics 2019-04, Vol.21 (4), p.43042
Main Authors:	Zhao, Xinxin, McLain, Marie A, Vijande, J, Ferrando, A, Carr, Lincoln D, García-March, M Á
Format:	Article
Language:	eng
Subjects:	Bose-Einstein condensates Bosons Broken symmetry nonequilibrium quantum dynamics Optical lattices partial symmetry breaking Physics Quantum theory ring trap Symmetry ultracold boson
Online Access:	Get full text
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Summary:	A vortex in a Bose-Einstein condensate on a ring undergoes quantum dynamics in response to a quantum quench in terms of partial symmetry breaking from a uniform lattice to a biperiodic one. Neither the current, a macroscopic measure, nor fidelity, a microscopic measure, exhibit critical behavior. Instead, the symmetry memory succeeds in identifying the critical symmetry breaking at which the system begins to forget its initial symmetry state. We further identify a symmetry energy difference in the low lying excited states which trends with the symmetry memory.
ISSN:	1367-2630 1367-2630