Dynamics of kicked spin-orbit-coupled Bose-Einstein condensates

Abstract

We investigate the dynamics of kicked pseudo-spin-1/2 Bose–Einstein condensates (BECs) with spin–orbit coupling (SOC) in a tightly confined toroidal trap. The system exhibits different dynamical behaviors depending on the competition among SOC, kick strength, kick period and interatomic interaction. For weak kick strength, with the increase of SOC the density profiles of two components evolve from overlapped symmetric distributions into staggered antisymmetric distributions, and the evolution of energy experiences a transition from quasiperiodic motion to modulated quantum beating. For large kick strength, when the SOC strength increases, the overlapped symmetric density distributions become staggered irregular patterns, and the energy evolution undergoes a transition from quasiperiodic motion to dynamical localization. Furthermore, in the case of weak SOC, the increase of kick period leads to a transition of the system from quantum beating to Rabi oscillation, while for the case of strong SOC the system demonstrates complex quasiperiodic motion.

Keywords

• Kicked Bose–Einstein condensates
• Spin–orbit coupling
• Quantum beating
• Dynamical localization
• Dynamics