Relaxation of superfluid turbulence in highly oblate Bose-Einstein condensates

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.

7 pages, 9 figures

References in corpus (6)

• Inverse Energy Cascade in Forced 2D Quantum Turbulence
• Critical Dynamics of a Two-dimensional Superfluid near a Non-Thermal Fixed Point
• Classical and quantum regimes of two-dimensional turbulence in trapped Bose-Einstein condensates
• Dissipative dynamics of superfluid vortices at non-zero temperatures
• Thermal dissipation in quantum turbulence
• Probing Phase Fluctuations in a 2D Degenerate Bose Gas by Free Expansion

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