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arXiv · 1403.4658

Relaxation of superfluid turbulence in highly oblate Bose-Einstein condensates

Woo Jin Kwon·Geol Moon·Jae-yoon Choi·Sang Won Seo·Yong-il Shin
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Abstract

We investigate thermal relaxation of superfluid turbulence in a highly oblate Bose-Einstein condensate. We generate turbulent flow in the condensate by sweeping the center region of the condensate with a repulsive optical potential. The turbulent condensate shows a spatially disordered distribution of quantized vortices and the vortex number of the condensate exhibits nonexponential decay behavior which we attribute to the vortex pair annihilation. The vortex-antivortex collisions in the condensate are identified with crescent-shaped, coalesced vortex cores. We observe that the nonexponential decay of the vortex number is quantitatively well described by a rate equation consisting of one-body and two-body decay terms. In our measurement, we find that the local two-body decay rate is closely proportional to $T^2/\mu$, where $T$ is the temperature and $\mu$ is the chemical potential.

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Woo Jin Kwon, Geol Moon, Jae-yoon Choi, Sang Won Seo, Yong-il Shin. 2014-03-19. Relaxation of superfluid turbulence in highly oblate Bose-Einstein condensates. https://doi.org/10.1103/physreva.90.063627

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