Magnetic solitons in Rabi-coupled Bose-Einstein condensates

Year: 2017

Authors: Qu CL., Tylutki M., Stringari S., Pitaevskii LP.

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

Abstract: We study magnetic solitons, solitary waves of spin polarization (i.e., magnetization), in binary Bose-Einstein condensates in the presence of Rabi coupling. We show that the system exhibits two types of magnetic solitons, called 2 pi and 0 pi solitons, characterized by a different behavior of the relative phase between the two spin components. 2 pi solitons exhibit a 2 pi jump of the relative phase, independent of their velocity, the static domain wall explored by Son and Stephanov being an example of such 2 pi solitons with vanishing velocity and magnetization. 0 pi solitons instead do not exhibit any asymptotic jump in the relative phase. Systematic results are provided for both types of solitons in uniform matter. Numerical calculations in the presence of a one-dimensional harmonic trap reveal that a 2 pi soliton evolves in time into a 0 pi soliton, and vice versa, oscillating around the center of the trap. Results for the effective mass, the Landau critical velocity, and the role of the transverse confinement are also discussed.

Journal/Review: PHYSICAL REVIEW A

Volume: 95 (3)      Pages from: 33614-1  to: 33614-14

More Information: We would like to thank Gabriele Ferrari, Anatoly Kamchatnov, and William D. Phillips for useful discussions. This work was supported by the QUIC grant of the Horizon2020 FET program and by Provincia Autonoma di Trento. M.T. was partially supported by the PL-Grid infrastructure.
KeyWords: Dark-bright Solitons; Oscillations
DOI: 10.1103/PhysRevA.95.033614

Citations: 33
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