Negative conductances of Josephson junctions: Voltage fluctuations and energetics
arXiv:0902.3080 · doi:10.1016/j.physe.2009.06.062
Abstract
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 Péclet number; (C) The efficiency of energy transduction from external currents. These issues are discussed in different parameter regimes that lead to: (i) absolute negative conductance; (ii) negative differential conductance, and (iii) normal, Ohmic-like conductance. Conditions for optimal operation of the system are studied.
7 pages, 4 figures, Presented at the "Frontiers of Quantum and Mesoscopic Thermodynamics", 28 July - 2 August 2008, Prague, Czech Republic
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- Transport driven by biharmonic forces: impact of correlated thermal noise
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- Two coupled Josephson junctions: dc voltage controlled by biharmonic current
- Directed transport in coupled noisy Josephson junctions controlled via ac signals