Fluctuation and interaction induced instability of dark solitons in single and binary condensates

Abstract

We show that the presence of soliton in a single-species condensate, at zero temperature, enhances the quantum depletion sufficient enough to induce dynamical instability of the system. We also predict that for two-species condensates, two Goldstone modes emerge in the excitation spectrum at phase separation. Of these, one is due to the presence of the soliton. We use Hartree-Fock-Bogoliubov theory with Popov approximation to examine the mode evolution, and demonstrate that when the anomalous mode collides with a higher energy mode it renders the solitonic state oscillatory unstable. We also report soliton induced change in the topology of the density profiles of the two-species condensates at phase-separation.

arXiv admin note: text overlap with arXiv:1307.5716

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Cited by in corpus (5)

• Nambu-Goldstone Modes Propagating along Topological Defects: Kelvin and Ripple Modes from Small to Large Systems
• Fluctuation driven topological transition of binary condensates in optical lattices
• Collective excitations in cigar-shaped spin-orbit coupled spin-1 Bose-Einstein condensates
• Scaling of Fluctuations in a Trapped Binary Condensate
• Evolution of Goldstone mode in binary condensate mixtures