Effect of capacitance onIhyphen;Vcharacteristics of overdamped Josephson junctions: Classical and quantum limits

摘要

We have considered the effect of capacitance on theIhyphen;Vcharacteristics of a Josephson tunnel junction in the overdamped limit. Both thermal and quantum fluctuations limits have been investigated. In the framework of the washboardhyphen;shaped potential the quantum and thermal fluctuations determine the time spent by the particle in and out of a potential well. These characteristic times have been calculated. The results allowed the possibility of obtaining theIhyphen;Vcharacteristics of the junctions. It is shown that for currentIsmaller than the criticalIc,Ihyphen;Vcurves with a higher slope correspond to larger capacitance values whereas forIIcthe curves with smaller capacitance lie above those with larger capacitance.