Wave patterns generated by a flow of a two-component Bose-Einstein condensate with spin-orbit interaction past a localized obstacle
Institute of Spectroscopy, Russian Academy of Sciences - Troitsk, Moscow, 142190, Russia
Received: 28 March 2014
Accepted: 17 June 2014
It is shown that a spin-orbit interaction leads to drastic changes in wave patterns generated by a flow of a two-component Bose-Einstein condensate (BEC) past an obstacle. The combined Rashba and Dresselhaus spin-orbit interaction affects in different ways two types of excitations —density and polarization waves— which can propagate in a two-component BEC. We show that the density and polarization “ship wave” patterns rotate in opposite directions around the axis located at the obstacle position and the angle of rotation depends on the strength of the spin-orbit interaction. This rotation is accompanied by a narrowing of the Mach cone. The influence of the spin-orbit coupling on density solitons and polarization breathers is studied numerically.
PACS: 03.75.Kk – Dynamic properties of condensates; collective and hydrodynamic excitations, superfluid flow / 03.75.Mn – Multicomponent condensates; spinor condensates
© EPLA, 2014