Striped states in weakly trapped ultracold Bose gases with Rashba spin-orbit coupling

Abstract

The striped state of ultracold bosons with Rashba spin-orbit coupling in a homogeneous infinite system has, as we show, a constant particle flow, which in a finite-size system would accumulate particles at the boundaries; it is thus not a physical steady state of the system. We propose, as a variational ansatz, a condensate wave function for a weakly trapped system which behaves similarly to the striped state near the center, but does not have particle flow at the boundaries. This state has a line of unquantized coreless vortices. We show, by minimizing the total energy, that our modified striped state has lower energy than the conventional striped state and it is thus a physically appropriate starting point to analyze striped states in finite systems.

5 pages, 5 figures, minor errors corrected

References in corpus (2)

• Spin-Orbit Coupled Spinor Bose-Einstein Condensates
• Spin-orbit coupled Bose-Einstein condensates

Cited by in corpus (10)

• Degenerate Quantum Gases with Spin-Orbit Coupling
• Approach for making visible and stable stripes in a spin-orbit-coupled Bose-Einstein superfluid
• Condensation transition of ultracold Bose gases with Rashba spin-orbit coupling
• Thermal Phase Transitions of Strongly Correlated Bosons with Spin-Orbit Coupling
• Dynamical generation of dark solitons in spin-orbit-coupled Bose-Einstein condensates
• Edge binding of sine-Gordon solitons in spin-orbit coupled Bose-Einstein condensates
• Topological Condensate in an Interaction Induced Gauge Potential
• Vortices and vortex states in Rashba spin-orbit-coupled condensates
• Harmonically trapped attractive and repulsive spin-orbit and Rabi coupled Bose-Einstein condensates
• Spatial order in a two-dimensional spin-orbit-coupled spin-1/2 condensate: superlattice, multi-ring and stripe formation