Dragging spin-orbit-coupled solitons by a moving optical lattice

Hidetsugu Sakaguchi*, Fumihide Hirano, Boris A. Malomed

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

It is known that the interplay of the spin-orbit-coupling (SOC) and mean-field self-attraction creates stable two-dimensional (2D) solitons (ground states) in spinor Bose-Einstein condensates. However, SOC destroys the system's Galilean invariance, therefore moving solitons exist only in a narrow interval of velocities, outside of which the solitons suffer delocalization. We demonstrate that the application of a relatively weak moving optical lattice (OL), with the 2D or quasi-1D structure, makes it possible to greatly expand the velocity interval for stable motion of the solitons. The stability domain in the system's parameter space is identified by means of numerical methods. In particular, the quasi-1D OL produces a stronger stabilizing effect than its full 2D counterpart. Some features of the domain are explained analytically.

Original languageEnglish
Article number245301
JournalJournal of Physics B: Atomic, Molecular and Optical Physics
Volume54
Issue number24
DOIs
StatePublished - 22 Dec 2021

Keywords

  • Bose-Einstein condensates
  • moving optical lattice
  • soliton
  • spin-orbit coupling

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