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Annals of Physics

The ground states of spin–orbit coupled Bose–Einstein condensates in spin-dependent potential

Congying Ma, Jingjing Jin, Haoran Sun, Wen-Yuan Liu, Qi Jie

Published May 15, 2025• 0 citations
Publisher
DOI
10.1016/j.aop.2025.170068

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We consider two-dimensional spinor F = 1 Bose–Einstein condensates in two types of radially-periodic potentials with spin–orbit coupling, i.e. , spin-independent and spin-dependent radially-periodic potentials. For the Bose–Einstein condensates in a spin-independent radially-periodic potential, the density of each component exhibits the periodic density modulation along the azimuthal direction, which realizes the necklacelike state in the ferromagnetic Bose–Einstein condensates. As the spin-exchange interaction increases, the necklacelike state gradually transition to the plane wave phase for the antiferromagnetic Bose–Einstein condensates with larger spin–orbit coupling. The competition of the spin-dependent radially-periodic potential, spin–orbit coupling, and spin-exchange interaction gives rise to the exotic ground-state phases when the Bose–Einstein condensates in a spin-dependent radially-periodic potential.
We consider a pseudospin-1/2 Bose–Einstein condensate with Rashba type of spin–orbit coupling and trapped in radially periodic potentials. The effects of spin–orbit coupling, amplitude of the lattice potential, and contact interaction, on the ground-state phases of the system are investigated numerically for two different types of radial lattices, i.e., with phase constant δ = 0 and π. We show that the system has a rich variety of ground-state phases, showing strong dependence on these controllable parameters. In addition, we find that for both types of radial lattices, such parameters can be used to induce desirable ground-state structures.