Effect of magnetic field on macroscopic quantum tunneling escape time in small Josephson junctions
Yu. N. Ovchinnikov, A. Barone, A. A. Varlamov
DOI 10.1103/PhysRevB.78.054521 · Physical Review B
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Abstract
We study the phenomenon of macroscopic quantum tunneling (MQT) in a finite-size Josephson junction (JJ) with an externally applied magnetic field. As is well known, the problem of MQT in a pointlike JJ is reduced to the study of the under-barrier motion of a quantum particle in the washboard potential. In the case of a finite-size JJ placed in magnetic field, this problem is considerably more complex since, besides the phase, the potential itself depends on space variables. We find the general expressions both for the crossover temperature T0 between thermally activated and MQT regimes and the escape time τesc. It turns out that in the proximity of particular values of magnetic field, the crossover temperature can vary nonmonotonically.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| YBCO Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| Bi2212 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
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