Spin-orbit coupled bosons in a double-well potential

Abstract

We study the quantum phase coherence and atomic distribution of two-component spin-orbit coupled bosons in a disordered double-well potential. For the spin-orbit coupled bosons have the equal intraspecies interaction, i.e., U↑↑=U↓↓, the quantum phase coherence exhibits the single periodical oscillation behavior and has the local maxima at certain values of disorder without the interspecies interaction. Considering the interspecies interaction, the single periodical oscillation evolved into the double periodical oscillations when the intraspecies interaction larger than the interspecies interaction. For the spin-orbit coupled bosons have the unequal intraspecies interaction, i.e., U↑↑≠U↓↓, the quantum phase coherence shows a triple periodical oscillations behavior without the interspecies interaction. After adding the interspecies interaction, the quantum phase coherence evolves from the triple periodical oscillations to the double periodical oscillations or the single periodical oscillation. The resonance feature of the quantum phase coherence becomes significant when the strengths of the intraspecies and interspecies interactions are comparable. The atomic distribution shows the stairs character.