Half-quantum vortex state in a spin-orbit coupled Bose-Einstein condensate

Details Half-quantum vortex state in a spin-orbit coupled Bose-Einstein condensate Half-quantum vortex state in a spin-orbit coupled Bose-Einstein condensate

2012-01-06

arxiv.org/abs/1201.1471v1

Physics

Condensed Matter

Quantum Gases

13 pages, 18 figures

Scientific paper

We investigate theoretically the condensate state and collective excitations of a two-component Bose gas in two-dimensional harmonic traps subject to isotropic Rashba spin-orbit coupling. In the weakly interacting regime when the inter-species interaction is larger than the intra-species interaction ($g_{\uparrow\downarrow}>g$), we find that the condensate ground state has a half-quantum-angular-momentum vortex configuration with spatial rotational symmetry and skyrmion-type spin texture. Upon increasing the interatomic interaction beyond a threshold $g_{c}$, the ground state starts to involve higher-order angular momentum components and thus breaks the rotational symmetry. In the case of $g_{\uparrow\downarrow}g_{c}$ and $g_{\uparrow\downarrow}

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