Motion of dark solitons in a non-uniform flow of Bose-Einstein condensate

Abstract

We study motion of dark solitons in a non-uniform one-dimensional flow of Bose-Einstein condensate. Our approach is based on Hamiltonian mechanics applied to the particle-like behavior of dark solitons in a slightly non-uniform and slowly changing surrounding. In one-dimensional geometry, the condensate's wave function undergoes the jump-like behavior across the soliton and this leads to generation of the counterflow in the background condensate. For correct description of soliton's dynamics, the contributions of this counterflow to the momentum and energy of the soliton are taken into account. The resulting Hamilton equations are reduced to the Newton-like equation for the soliton's path and this Newton equation is solved in several typical situations. The analytical results are confirmed by numerical calculations.

9 pages, 8 figures

References in corpus (5)

• Oscillations and interactions of dark and dark-bright solitons in Bose-Einstein condensates
• Experimental observation of oscillating and interacting matter wave dark solitons
• Dynamics of ring dark solitons in Bose-Einstein condensates and nonlinear optics
• Dynamic soliton-mean flow interaction with nonconvex flux
• Dynamics of solitary waves in ultracold gases in terms of observable quantities

Cited by in corpus (4)

• Soliton-mean field interaction in Korteweg-de Vries dispersive hydrodynamics
• Propagation of generalized Korteweg-de Vries solitons along large-scale waves
• Propagation of dark solitons of DNLS equation along a large-scale background
• Solitary wave-mean flow interaction in strongly nonlineardispersive shallow water waves