The subgap quasiparticle current I-qp in Josephson junctions may be affected by thermal and quantum fluctuations of the electromagnetic environment. To mimic a realistic setup, the environment is assumed not to be in thermal equilibrium with the junction. At very low temperatures of the junction I-qp is finite, instead of being exponentially suppressed, as predicted by the BCS theory. It depends on the impedance of the circuit. We use our simple model to interpret the observed flattening of I-qp in Nb/AlOx/Nb high quality junctions.
Saturation of the subgap quasiparticle current in Nb/AlOx/Nb high quality Josephson junctions at very low temperatures
FALCI, Giuseppe;
1997-01-01
Abstract
The subgap quasiparticle current I-qp in Josephson junctions may be affected by thermal and quantum fluctuations of the electromagnetic environment. To mimic a realistic setup, the environment is assumed not to be in thermal equilibrium with the junction. At very low temperatures of the junction I-qp is finite, instead of being exponentially suppressed, as predicted by the BCS theory. It depends on the impedance of the circuit. We use our simple model to interpret the observed flattening of I-qp in Nb/AlOx/Nb high quality junctions.File in questo prodotto:
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