Macroscopic quantum tunneling in "small" Josephson junctions in magnetic field

Details Macroscopic quantum tunneling in "small" Josephson junctions in magnetic field Macroscopic quantum tunneling in "small" Josephson junctions in magnetic field

2007-01-31

arxiv.org/abs/cond-mat/0701784v1

Physics

Condensed Matter

Superconductivity

Scientific paper

10.1103/PhysRevLett.99.037004

We study the phenomenon of macroscopic quantum tunneling (MQT) in small Josephson junctions (JJ) with an externally applied magnetic field. The latter results in the appearance of the Fraunhofer type modulation of the current density along the barrier. The problem of MQT for a point-like JJ is reduced to the motion of the quantum particle in the washboard potential. In the case of a finite size JJ under consideration, this problem corresponds to a MQT in potential which itself, besides the phase, depends on space variables. Finally, the general expression for the crossover temperature T_0 between thermally activated and macroscopic quantum tunneling regimes and the escaping time tau_esc have been calculated.

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