Negative conductances of Josephson junctions: Voltage fluctuations and energetics
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 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.
Cite
@article{arxiv.0902.3080,
title = {Negative conductances of Josephson junctions: Voltage fluctuations and energetics},
author = {L. Machura and M. Kostur and P. Talkner and P. Hanggi and J. Luczka},
journal= {arXiv preprint arXiv:0902.3080},
year = {2010}
}
Comments
7 pages, 4 figures, Presented at the "Frontiers of Quantum and Mesoscopic Thermodynamics", 28 July - 2 August 2008, Prague, Czech Republic