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arXiv · 1601.06935

Double-Quantum Spin Vortices in SU(3) Spin-Orbit Coupled Bose Gases

Wei Han·Xiao-Fei Zhang·Shu-Wei Song·Hiroki Saito·Wei Zhang·Wu-Ming Liu·Shou-Gang Zhang
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Abstract

We show that double-quantum spin vortices, which are characterized by doubly quantized circulating spin currents and unmagnetized filled cores, can exist in the ground states of SU(3) spin-orbit coupled Bose gases. It is found that the SU(3) spin-orbit coupling and spin-exchange interaction play important roles in determining the ground-state phase diagram. In the case of effective ferromagnetic spin interaction, the SU(3) spin-orbit coupling induces a three-fold degeneracy to the magnetized ground state, while in the antiferromagnetic spin interaction case, the SU(3) spin-orbit coupling breaks the ordinary phase rule of spinor Bose gases, and allows the spontaneous emergence of double-quantum spin vortices. This exotic topological defect is in stark contrast to the singly quantized spin vortices observed in existing experiments, and can be readily observed by the current magnetization-sensitive phase-contrast imaging technique.

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Wei Han, Xiao-Fei Zhang, Shu-Wei Song, Hiroki Saito, Wei Zhang, Wu-Ming Liu, Shou-Gang Zhang. 2016-01-26. Double-Quantum Spin Vortices in SU(3) Spin-Orbit Coupled Bose Gases. https://doi.org/10.1103/physreva.94.033629

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