Scientific Results

Persistent currents in two-component condensates in a toroidal trap

Year: 2014

Authors: Abad M., Sartori A., Finazzi S., Recati A.

Autors Affiliation: INO-CNR BEC Center and Dipartimento di Fisica, Università di Trento, 38123 Povo, Italy; Laboratoire Matériaux et Phénomènes Quantiques, Université Paris Diderot-Paris 7 and CNRS, Bâtiment Condorcet, 75205 Paris Cedex 13, France

Abstract: The stability of persistent currents in a two-component Bose-Einstein condensate in a toroidal trap is studied in both the miscible and the immiscible regimes. In the miscible regime we show that superflow decay is related to linear instabilities of the spin-density Bogoliubov mode. We find a region of partial stability, where the flow is stable in the majority component while it decays in the minority component. We also characterize the dynamical instability appearing for a large relative velocity between the two components. In the immiscible regime the stability criterion is modified and depends on the specific density distribution of the two components. The effect of a coherent coupling between the two components is also discussed.

Journal/Review: PHYSICAL REVIEW A

Volume: 89 (5)      Pages from: 053602  to: 053602

More Information: We acknowledge stimulating discussions with I. Carusotto, Z. Hadzibabic, and T. Ozawa. This work has been financially supported by ERC through the QGBE grant and by Provincia Autonoma di Trento.
DOI: 10.1103/PhysRevA.89.053602

Citations: 20
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