Paired superfluidity and fractionalized vortices in systems of spin-orbit coupled bosons

Article

关键词: TOPOLOGICAL INSULATORS;    SUPERCONDUCTORS;   

DOI  :  10.1103/PhysRevB.84.060508

来源: SCIE

【 摘 要 】

In this Rapid Communication we study finite-temperature properties of spin-1/2 interacting bosons with spin-orbit coupling in two dimensions. When the ground state has stripe order, we show that thermal fluctuations will first melt the stripe order and lead to a superfluid of boson pairs if the spin-orbit coupling is isotropic or nearly isotropic. Such a phase supports fractionalized quantum vortices. The Kosterlitz-Thouless transition from superfluid to normal state is driven by proliferation of half vortices. When the ground state is a plane-wave state, the transition to normal state is driven by conventional Kosterlitz-Thouless transition. However, the critical temperature will drop to zero for isotropic spin-orbit coupling.

【 授权许可】

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