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Temperature-induced decay of persistent currents in a superfluid ultracold gas

A. Kumar, S. Eckel, F. Jendrzejewski, and G. K. Campbell
Phys. Rev. A 95, 021602(R) – Published 24 February 2017
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Abstract

We study how temperature affects the lifetime of a quantized, persistent current state in a toroidal Bose-Einstein condensate. When the temperature is increased, we find a decrease in the persistent current lifetime. Comparing our measured decay rates to simple models of thermal activation and quantum tunneling, we do not find agreement. We also measured the size of the hysteresis loops in our superfluid ring as a function of temperature, enabling us to extract the critical velocity. The measured critical velocity is found to depend strongly on temperature, approaching the zero-temperature mean-field solution as the temperature is decreased. This indicates that an appropriate definition of critical velocity must incorporate the role of thermal fluctuations, something not explicitly contained in traditional theories.

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  • Received 21 July 2016

DOI:https://doi.org/10.1103/PhysRevA.95.021602

©2017 American Physical Society

Physics Subject Headings (PhySH)

Atomic, Molecular & Optical

Authors & Affiliations

A. Kumar, S. Eckel, F. Jendrzejewski, and G. K. Campbell*

  • Joint Quantum Institute, National Institute of Standards and Technology and University of Maryland, Gaithersburg, Maryland 20899, USA

  • *gcampbe1@umd.edu

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Issue

Vol. 95, Iss. 2 — February 2017

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