Vortex-induced phase-slip dissipation in a toroidal Bose-Einstein condensate flowing through a barrier

Year: 2009

Authors: Piazza F., Collins L.A., Smerzi A.

Autors Affiliation: Dipartimento di Fisica and CNR–INFM BEC Center, Universitŕ di Trento, I-38050 Povo, Italy;
Theoretical Division, Los Alamos National Laboratory, Mail Stop B214, Los Alamos, New Mexico 87545, USA

Abstract: We study superfluid dissipation due to phase slips for a Bose-Einstein condensate flowing through a repulsive barrier inside a torus. The barrier is adiabatically raised across the annulus, while the condensate flows with a finite quantized angular momentum. At a critical height, a vortex moves from the inner region and reaches the barrier to eventually circulate around the annulus. At a higher critical height, an antivortex also enters into the torus from the outer region. Both vortex and antivortex decrease the total angular momentum by leaving behind a 2 pi phase slip. When they collide and annihilate or orbit along the same loop, the condensate suffers a global 2 pi phase slip, and the total angular momentum decreases by one quantum. In hydrodynamic regime, the instability sets in when the local superfluid velocity equals the sound speed inside the barrier region.

Journal/Review: PHYSICAL REVIEW A

Volume: 80 (2)      Pages from: 021604  to: 021604

More Information: We would like to thank B. Schneider, F. Dalfovo, L. Pitaevskii, and S. Stringari for helpful discussions and Dr. S. Hu for assistance with the 3D GPE program. We acknowledge useful exchanges with W. Phillips, S. Muniz, A. Ramanathan, K. Helmerson, and P. Clade. The Los Alamos National Security, LLC for the National Nuclear Security Administration of the (U.S.) Department of Energy under Contract No. DE-AC52-06NA25396.
DOI: 10.1103/PhysRevA.80.021601

Citations: 54
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