Nonequilibrium dynamics of vortex arrest in a finite-temperature Bose-Einstein condensate

Journal Article · Fri Jan 15 00:00:00 EST 2010 · Physical Review. A

DOI:https://doi.org/10.1103/PHYSREVA.81.013610· OSTI ID:21408158

Wright, T M; Bradley, A S; Ballagh, R J ^[1]

---

1. Jack Dodd Centre for Quantum Technology, Department of Physics, University of Otago, P.O. Box 56, Dunedin (New Zealand)

We perform finite-temperature dynamical simulations of the arrest of a rotating Bose-Einstein condensate by a fixed trap anisotropy, using a Hamiltonian classical-field method. We consider a quasi-two-dimensional condensate containing a single vortex in equilibrium with a rotating thermal cloud. Introducing an elliptical deformation of the trapping potential leads to the loss of angular momentum from the system. We identify the condensate and the complementary thermal component of the nonequilibrium field and compare the evolution of their angular momenta and angular velocities. By varying the trap anisotropy we alter the relative efficiencies of the vortex-cloud and cloud-trap coupling. For strong trap anisotropies the angular momentum of the thermal cloud may be entirely depleted before the vortex begins to decay. For weak trap anisotropies, the thermal cloud exhibits a long-lived steady state in which it rotates at an intermediate angular velocity.

• OSTI ID: 21408158
• Journal Information: Physical Review. A, Vol. 81, Issue 1; Other Information: DOI: 10.1103/PhysRevA.81.013610; (c) 2010 The American Physical Society; ISSN 1050-2947
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
ANGULAR MOMENTUM
ANGULAR VELOCITY
ANISOTROPY
BOSE-EINSTEIN CONDENSATION
COMPARATIVE EVALUATIONS
DEFORMATION
EFFICIENCY
EVOLUTION
HAMILTONIANS
STEADY-STATE CONDITIONS
TWO-DIMENSIONAL CALCULATIONS
EVALUATION
MATHEMATICAL OPERATORS
QUANTUM OPERATORS
VELOCITY