Anisotropic Superfluidity in a Dipolar Bose Gas

Journal Article · Fri Feb 11 00:00:00 EST 2011 · Physical Review Letters

DOI:https://doi.org/10.1103/PHYSREVLETT.106.065301· OSTI ID:21532302

Ticknor, Christopher ^[1]; Wilson, Ryan M; Bohn, John L ^[2]

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1. Theoretical Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87545 (United States)
2. JILA, NIST and Department of Physics, University of Colorado, Boulder, Colorado 80309 (United States)

We study the superfluid character of a dipolar Bose-Einstein condensate (DBEC) in a quasi-two dimensional geometry. We consider the dipole polarization to have some nonzero projection into the plane of the condensate so that the effective interaction is anisotropic in this plane, yielding an anisotropic dispersion relation. By performing direct numerical simulations of a probe moving through the DBEC, we observe the sudden onset of drag or creation of vortex-antivortex pairs at critical velocities that depend strongly on the direction of the probe's motion. This anisotropy emerges because of the anisotropic manifestation of a rotonlike mode in the system.

• OSTI ID: 21532302
• Journal Information: Physical Review Letters, Vol. 106, Issue 6; Other Information: DOI: 10.1103/PhysRevLett.106.065301; (c) 2011 American Institute of Physics; ISSN 0031-9007
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
ANISOTROPY
BOSE-EINSTEIN CONDENSATION
BOSE-EINSTEIN GAS
COMPUTERIZED SIMULATION
CONDENSATES
CRITICAL VELOCITY
DIPOLES
DISPERSION RELATIONS
POLARIZATION
SUPERFLUIDITY
TWO-DIMENSIONAL CALCULATIONS
VORTICES
MULTIPOLES
SIMULATION
VELOCITY