Decay of the relative phase domain wall into confined vortex pairs: The case of a coherently coupled bosonic mixture

Year: 2019

Authors: Gallemi A., Pitaevskii LP., Stringari S., Recati A.

Autors Affiliation: Univ Trento, INO CNR BEC Ctr, I-38123 Povo, Italy; Univ Trento, Dipartimento Fis, I-38123 Povo, Italy; INFN, Trento Inst Fundamental Phys & Applicat, I-38123 Trento, Italy; RAS, Kapitza Inst Phys Problems, Kosygina 2, Moscow 119334, Russia

Abstract: A domain wall of relative phase in a flattened harmonically trapped Bose-Einstein condensed mixture of two atomic hyperfine states, subject to a stationary Rabi coupling of intensity Omega, is predicted to decay through two different mechanisms. For small values of Omega the instability has an energetic nature and is associated with the formation of a vortex-antivortex pair of the same atomic hyperfine states, the motion of which inside the trap causes the emergence of magnetization, the bending of the domain wall, and its consequent fragmentation. For large values of Omega the domain wall instead undergoes a dynamic snake instability, caused by the negative value of its effective mass, and results in the fast fragmentation of the wall into smaller domain walls confining vortex pairs of different atomic species. Numerical predictions are given by solving the time-dependent Gross-Pitaevskii equation in experimentally available configurations of mixtures of sodium atomic gases.


Volume: 100 (2)      Pages from: 023607-1  to: 023607-8

More Information: This project has received funding from the European Union´s Horizon 2020 research and innovation programme under Grant No. 641122 “QUIC” the FISh project of the Istituto Nazionale di Fisica Nucleare, and the Provincia Autonoma di Trento. We would like to acknowledge useful discussions with Gabriele Ferrari and Giacomo Lamporesi.
KeyWords: WAVES
DOI: 10.1103/PhysRevA.100.023607

Citations: 13
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