Negative conductances of Josephson junctions: Voltage fluctuations and energetics

✍ Scribed by L. Machura; M. Kostur; P. Talkner; P. Hänggi; J. Łuczka

• Book ID: 104086500
• Publisher: Elsevier Science
• Year: 2010
• Tongue: English
• Weight: 515 KB
• Volume: 42
• Category: Article
• ISSN: 1386-9477
• DOI: 10.1016/j.physe.2009.06.062

✦ Synopsis

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 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.