Dynamics of Dark-Bright Solitons in Cigar-Shaped Bose-Einstein Condensates

Abstract

We explore the stability and dynamics of dark-bright solitons in two-component elongated Bose-Einstein condensates by developing effective 1D vector equations as well as solving the corresponding 3D Gross-Pitaevskii equations. A strong dependence of the oscillation frequency and of the stability of the dark-bright (DB) soliton on the atom number of its components is found. Spontaneous symmetry breaking leads to oscillatory dynamics in the transverse degrees of freedom for a large occupation of the component supporting the dark soliton. Moreover, the interactions of two DB solitons are investigated with special emphasis on the importance of their relative phases. Experimental results showcasing dark-bright soliton dynamics and collisions in a BEC consisting of two hyperfine states of ${}^{87}$Rb confined in an elongated optical dipole trap are presented.

4 pages, 5 figures

References in corpus (7)

• Oscillations and interactions of dark and dark-bright solitons in Bose-Einstein condensates
• Experimental observation of oscillating and interacting matter wave dark solitons
• Effective mean-field equations for cigar-shaped and disk-shaped Bose-Einstein condensates
• Quasi-1D Bose-Einstein condensates in the dimensional crossover regime
• Vector solitons in nearly-one-dimensional Bose-Einstein condensates
• Interaction of dark-bright solitons in two-component Bose-Einstein condensates
• Dark matter-wave solitons in the dimensionality crossover

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