Vortex formation in a spin-orbit-coupled Bose-Einstein condensates with static quadrupole magnetic field

Abstract We investigate the vortex structures excited by Ioffe-Pritchard magnetic field and Dresselhaus-type spin-orbit coupling in F = 2 ferromagnetic Bose-Einstein condensates. In the weakly interatomic interacting regime, an external magnetic field can generate a polar-core vortex in which the canonical particle current is zero. With the combined effect of spin-orbit coupling and magnetic field, the ground state experiences a transition from polar-core vortex to Mermin-Ho vortex, in which the canonical particle current is anticlockwise. For fixed spin-orbit coupling strengths, the evolution of phase winding, magnetization and degree of phase separation with magnetic field are studied. Additionally, with further increasing spin-orbit coupling strength, the condensate exhibits symmetrical density domains separated by radial vortex arrays. Our work paves the way to explore exotic topological excitations in high-spin system.

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SU(3) Spin–Orbit Coupled Rotating Bose–Einstein Condensate Subject to a Gradient Magnetic Field

Frontiers in Physics ◽

10.3389/fphy.2021.768799 ◽

2021 ◽

Vol 9 ◽

Author(s):

Guang-Ping Chen ◽

Pu Tu ◽

Chang-Bing Qiao ◽

Jin-Xia Zhu ◽

Qi Jia ◽

...

Keyword(s):

Magnetic Field ◽

Einstein Condensate ◽

Orbit Coupling ◽

Ground State Structure ◽

Spin Orbit Coupling ◽

Spin Orbit ◽

State Structure ◽

Gradient Magnetic Field ◽

Bose Einstein Condensate ◽

Bose Einstein

We consider a harmonically trapped rotating spin-1 Bose–Einstein condensate with SU(3) spin–orbit coupling subject to a gradient magnetic field. The effects of SU(3) spin–orbit coupling, rotation, and gradient magnetic field on the ground-state structure of the system are investigated in detail. Our results show that the interplay among SU(3) spin–orbit coupling, rotation, and gradient magnetic field can result in a variety of ground states, such as a vortex ring and clover-type structure. The numerical results agree well with our variational analysis results.

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Ground state of spin-orbit coupled rotating two-component Bose-Einstein condensate in gradient magnetic field

Acta Physica Sinica ◽

10.7498/aps.67.20180539 ◽

2018 ◽

Vol 67 (11) ◽

pp. 110302

Author(s):

Li Ji ◽

Liu Wu-Ming

Keyword(s):

Magnetic Field ◽

Ground State ◽

Einstein Condensate ◽

Spin Orbit ◽

Gradient Magnetic Field ◽

Bose Einstein Condensate ◽

Two Component ◽

Bose Einstein

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Vortex chains induced by anisotropic spin-orbit coupling and magnetic field in spin-2 Bose-Einstein condensates

Chinese Physics B ◽

10.1088/1674-1056/ac4020 ◽

2021 ◽

Author(s):

Hao Zhu ◽

Shou-Gen Yin ◽

Wu-Ming Liu

Keyword(s):

Magnetic Field ◽

Momentum Distribution ◽

Physical Nature ◽

Orbit Coupling ◽

Spin Orbit Coupling ◽

Spin Orbit ◽

Atomic Interactions ◽

Vortex Chain ◽

Bose Einstein ◽

The Magnetic Field

Abstract We investigate the anisotropic spin-orbit coupled spin-2 Bose-Einstein condensates with Ioffe-Pritchard magnetic field. With nonzero magnetic field, anisotropic spin-orbit coupling will introduce several vortices and further generate a vortex chain. Inside the vortex chain, vortices connect to each other, forming a line along the axis. The physical nature of the vortex chain can be explained by the particle current and the momentum distribution. The vortex number inside the vortex chain can be influenced via varying the magnetic field. Through adjusting the anisotropy of the spin-orbit coupling, the direction of the vortex chain is changed, and the vortex lattice can be triggered. Moreover, accompanied by the variation of the atomic interactions, the density and the momentum distribution of the vortex chain are affected. The realization and the detection of the vortex chain are compatible with current experimental techniques.

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