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Quantum Nucleation of Phase Slips in Bose—Einstein Condensates

  • H. P. Büchler
  • V. B. Geshkenbein
  • G. Blatter
Chapter
Part of the Lecture Notes in Physics book series (LNP, volume 571)

Abstract

We present a theoretical study of quantum fluctuations in a Bose-Einstein condensate confined within a thin cylindrical trap and perturbed by a moving impurity. We derive an effective action which maps the problem to that of a massive particle with damping in a periodic potential. Quantum fluctuations lead to a finite nucleation rate of phase slips and we make use of known results in our determination of the transport characteristic. Real Bose-Einstein condensate are finite systems and exhibit interesting effects depending on topology: in superfluid rings we obtain a critical velocity below which the nucleation rate is quenched. In a cigar shaped condensate the low-energy action is equivalent to that of a capacitively shunted Josephson junction. The state with a well defined phase difference across the impurity then is unstable towards a decoupled state with a fixed number of particles on either side of the impurity.

Keywords

Nucleation Rate Critical Velocity Einstein Condensate Phase Slip Bloch Oscillation 
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Copyright information

© Springer-Verlag Berlin Heidelberg 2001

Authors and Affiliations

  • H. P. Büchler
    • 1
  • V. B. Geshkenbein
    • 1
    • 2
  • G. Blatter
    • 1
  1. 1.Theoretische PhysikETH-HönggerbergZürichSwitzerland
  2. 2.Landau Institute for Theoretical PhysicsMoscowRussia

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