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arXiv · 1411.5868

Topological Condensate in an Interaction Induced Gauge Potential

Jun-hui Zheng·Bo Xiong·G. Juzeliunas·Daw-Wei Wang
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Abstract

We systematically investigate the ground state and elementary excitations of a Bose-Einstein Condensate with a synthetic vector potential, which is induced by the many-body effects and atom-light coupling. For a sufficiently strong inter-atom interaction, we find the condensate undergoes a Stoner-type ferromagnetic transition through the self-consistent coupling with the vector potential. For a weak interaction, the critical velocity of a supercurrent is found anisotropic due to the density fluctuations affecting the gauge field. We further analytically demonstrate the topological ground state with a coreless vortex ring in a 3D harmonic trap and a coreless vortex-antivortex pair in a 2D trap. The circulating persistent current is measurable in the time-of-flight experiment or in the dipolar oscillation through the violation of Kohn theorem.

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Jun-hui Zheng, Bo Xiong, G. Juzeliunas, Daw-Wei Wang. 2014-12-04. Topological Condensate in an Interaction Induced Gauge Potential. https://doi.org/10.1103/physreva.92.013604

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