Confinement and precession of vortex pairs in coherently coupled Bose-Einstein condensates

Year: 2016

Authors: Tylutki M., Pitaevskii L. P., Recati A., Stringari S.

Autors Affiliation: Univ Trento, INO CNR BEC Ctr, Via Sommar 14, I-38123 Povo, Italy; Univ Trento, Dipartimento Fis, Via Sommar 14, I-38123 Povo, Italy; RAS, Kapitza Inst Phys Problems, Kosygina 2, Moscow 119334, Russia; Tech Univ Munich, Dept Phys, James Franck Str 1, D-85748 Garching, Germany.

Abstract: The dynamic behavior of vortex pairs in two-component coherently (Rabi) coupled Bose-Einstein condensates is investigated in the presence of harmonic trapping. We discuss the role of the surface tension associated with the domain wall connecting two vortices in condensates of atoms occupying different spin states and its effect on the precession of the vortex pair. The results, based on the numerical solution of the Gross-Pitaevskii equations, are compared with the predictions of an analytical macroscopic model and are discussed as a function of the size of the pair, the Rabi coupling, and the intercomponent interaction. We show that the increase of the Rabi coupling results in the disintegration of the domain wall into smaller pieces, connecting vortices of newly created vortex pairs. The resulting scenario is the analog of quark confinement and string breaking in quantum chromodynamics

Journal/Review: PHYSICAL REVIEW A

Volume: 93 (4)      Pages from: 043623-1  to: 043623-5

More Information: We are grateful to F. Dalfovo, A. Fetter, G. Ferrari, and C. Qu for stimulating discussions. This work was supported by ERC through the QGBE grant, by the QUIC grant of the Horizon2020 FET program, and by Provincia Autonoma di Trento. A.R. acknowledges support from the Alexander von Humboldt Foundation. This work was supported in part by the PL-Grid infrastructure (M.T.).
KeyWords: Coherently coupled Bose Gases; Vortices; String Breaking
DOI: 10.1103/PhysRevA.93.043623

ImpactFactor: 2.925
Citations: 51
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