Quenching dynamics of the bright solitons and other localized states in spin-orbit coupled Bose-Einstein condensates

TL;DR

This paper investigates how quenching spin-orbit and Rabi couplings in binary Bose-Einstein condensates influences their spin transport and induces various dynamical phenomena, with potential experimental applications in $^{39}$K condensates.

Contribution

It demonstrates control over spin transport and predicts new dynamical states in spin-orbit coupled BECs through numerical simulations of coupled Gross-Pitaevskii equations.

Findings

Control of spin transport via quenching couplings

Prediction of dark-bright states and solitons

Observation of spin-mixing and miscible-immiscible transitions

Abstract

We study the dynamics of binary Bose-Einstein condensates made of ultracold and dilute alkali-metal atoms in a quasi-one-dimensional setting. Numerically solving the two coupled Gross-Pitaevskii equations which accurately describe the system dynamics, we demonstrate that the spin transport can be controlled by suitably quenching spin-orbit (SO) and Rabi coupling strengths. Moreover, we predict a variety of dynamical features induced by quenching: broken oscillations, breathers-like oscillating patterns, spin-mixing-demixing, miscible-immiscible transition, emerging dark-bright states, dark solitons, and spin-trapping dynamics. We also outline the experimental relevance of the present study in manipulating the spin states in $^{39}$K condensates.