Temperature induced decay of persistent currents in a superfluid ultracold gas
arXiv:1608.02894 · doi:10.1103/PhysRevA.95.021602
Abstract
We study how temperature affects the lifetime of a quantized, persistent current state in a toroidal Bose-Einstein condensate (BEC). 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 hysteresis loops size 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.
Main paper: 5 pages, 4 figures. Supplemental material: 4 pages
References in corpus (10)
- Observation of persistent flow of a Bose-Einstein condensate in a toroidal trap
- Dynamics and statistical mechanics of ultra-cold Bose gases using c-field techniques
- Quench-induced supercurrents in an annular Bose gas
- Persistent currents in spinor condensates
- Observation of Solitonic Vortices in Bose-Einstein Condensates
- Interferometric measurement of the current-phase relationship of a superfluid weak link
- Solitons, solitonic vortices, and vortex rings in a confined Bose-Einstein condensate
- Critical velocity of superfluid flow through single barrier and periodic potentials
- Dissipative dynamics of superfluid vortices at non-zero temperatures
- Thermal dissipation in quantum turbulence
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