Berry Phase Effects on the Dynamics of Quasiparticles in a Superfluid with a Vortex

Journal Article · Fri Jul 28 04:00:00 EDT 2006 · Physical Review Letters

DOI:https://doi.org/10.1103/PHYSREVLETT.97.040401· OSTI ID:20860556

Chuanwei, Zhang ^[1]; Dudarev, Artem M ^[1]; Qian, Niu ^[1]

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1. Department of Physics, University of Texas, Austin, Texas 78712-1081 (United States)

We study quasiparticle dynamics in a Bose-Einstein condensate with a vortex by following the center of mass motion of a Bogoliubov wave packet, and find important Berry-phase effects due to the background flow. We show that the Berry phase invalidates the usual canonical relation between the mechanical momentum and position variables, leading to important modifications of quasiparticle statistics and thermodynamic properties of the condensates. Applying these results to a vortex in an infinite uniform superfluid, we find that the total transverse force acting on the vortex is proportional to the superfluid density. We propose an experimental setup to directly observe Berry phase effects through measuring local thermal atoms' momentum distribution around a vortex.

• OSTI ID: 20860556
• Journal Information: Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 4 Vol. 97; ISSN 0031-9007; ISSN PRLTAO
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
BOGOLYUBOV METHOD
BOSE-EINSTEIN CONDENSATION
CENTER-OF-MASS SYSTEM
QUASI PARTICLES
SUPERFLUIDITY
THERMODYNAMIC PROPERTIES
VORTICES
WAVE PACKETS