KIP-Veröffentlichungen

Jahr 2017
Autor(en) Avinash Kumar, Stephen Eckel, Fred Jendrzejewski, Gretchen K. Campbell
Titel Temperature induced decay of persistent currents in superfluid ultracold gas
KIP-Gruppe(n) F21
Dokumentart Paper
Keywords (angezeigt) JQI
Quelle Phys. Rev. A 95 (2017) 021602(R)
doi 10.1103/PhysRevA.95.021602
Abstract (en)

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,wedo 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 thermalfluctuations, something not explicitly contained in traditional theories.

bibtex
@article{Kumar2017,
  author   = {Avinash Kumar, Stephen Eckel, Fred Jendrzejewski, Gretchen K. Campbell},
  title    = {Temperature induced decay of persistent currents in superfluid ultracold gas},
  journal  = {Phys. Rev. A},
  year     = {2017},
  volume   = {95},
  pages    = {021602(R)},
  doi      = {10.1103/PhysRevA.95.021602},
  url      = {http://arxiv.org/abs/1608.02894}
}
Beispielbild
URL Kumar2017
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