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.
|Titolo:||Saturation of the subgap quasiparticle current in Nb/AlOx/Nb high quality Josephson junctions at very low temperatures|
|Data di pubblicazione:||1997|
|Appare nelle tipologie:||2.1 Contributo in volume (Capitolo o Saggio)|