Magnetic solitons in Rabi-coupled Bose-Einstein condensates

Chunlei Qu, Marek Tylutki, Sandro Stringari, Lev P. Pitaevskii

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33 Scopus citations

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 2π and 0π solitons, characterized by a different behavior of the relative phase between the two spin components. 2π solitons exhibit a 2π jump of the relative phase, independent of their velocity, the static domain wall explored by Son and Stephanov being an example of such 2π solitons with vanishing velocity and magnetization. 0π 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 2π soliton evolves in time into a 0π 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.

Original languageEnglish
Article number033614
JournalPhysical Review A
Volume95
Issue number3
DOIs
StatePublished - 14 Mar 2017

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