Decay of Superflow Confined in Thin Torus: A Realization of Tunneling Quantum Fields

Details Decay of Superflow Confined in Thin Torus: A Realization of Tunneling Quantum Fields Decay of Superflow Confined in Thin Torus: A Realization of Tunneling Quantum Fields

1998-11-02

arxiv.org/abs/cond-mat/9811010v2

Journal of the Physical Society of Japan, 68, 3778 (1999).

Physics

Condensed Matter

4 pages, 2 figures, REVTeX

Scientific paper

10.1143/JPSJ.68.3778

The quantum nucleation of phase slips in neutral superfluids confined in a thin torus is investigated by means of the collective coordinate method. We have devised, with numerical justification, a certain collective coordinate to describe the quantum nucleation process of a phase slip. Considering the quantum fluctuation around the local minimum of the action, we calculate the effective mass of the phase slip. Due to the coherence of the condensate throughout the torus, the effective mass is proportional to the circumference L of the torus, and the decay rate has a strong exponential L-dependence.

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