Negative conductances of Josephson junctions: Voltage fluctuations and energetics

Negative conductances of Josephson junctions Voltage fluctuations and energetics

We study a resistively and capacitively shunted Josephson junction, which is driven by a combination of time-periodic and constant currents. Our investigations concern three main problems: (A) the voltage fluctuations across the junction; (B) the quality of transport expressed in terms of the P eclet number; and (C) the efficiency of energy transduction from external currents. These issues are ...

Anomalous transport in biased ac-driven Josephson junctions: Negative conductances

We investigate classical anomalous electrical transport in a driven, resistively, and capacitively shunted Josephson junction device. Intriguing transport phenomena are identified in chaotic regimes when the junction is subjected to both a time-periodic ac and a constant biasing dc current. The dependence of the voltage across the junction on the dc exhibits a rich diversity of anomalous transp...

Josephson Junctions for Present and Next Generation Voltage Metrology

Current-voltage characteristics and breakpoint phenomenon in intrinsic Josephson junctions

We review here our latest results on the investigation of the current-voltage characteristics and breakpoint phenomenon in the stacks with finite number of intrinsic Josephson junctions in layered superconductors.

Current responses and voltage fluctuations in Josephson-junction systems

– We consider arrays of Josephson junctions as well as single junctions in both the classical and quantum-mechanical regimes, and examine the generalized (frequency-dependent) resistance, which describes the dynamic responses of such Josephson-junction systems to external currents. It is shown that the generalized resistance and the power spectrum of voltage fluctuations are related via the flu...