Negative conductances of Josephson junctions: Voltage fluctuations and energetics

Details Negative conductances of Josephson junctions: Voltage fluctuations and energetics Negative conductances of Josephson junctions: Voltage fluctuations and energetics

2009-02-18

arxiv.org/abs/0902.3080v1

Phys. E 42, p 590, (2010)

Physics

Condensed Matter

Superconductivity

7 pages, 4 figures, Presented at the "Frontiers of Quantum and Mesoscopic Thermodynamics", 28 July - 2 August 2008, Prague, Cz

Scientific paper

10.1016/j.physe.2009.06.062

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; (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.

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