Negative conductances of Josephson junctions: Voltage fluctuations and energetics

作者：Machura L; Kostur M; Talkner P; Haenggi P; Luczka J^*

来源：Physica E: Low-Dimensional Systems and Nanostructures , 2010, 42(3): 590-594.

DOI：10.1016/j.physe.2009.06.062

• Josephson junction
• Anomalous transport
• Negative conductance
• Diffusion
• Voltage fluctuations
• Efficiency

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 Peclet 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.

• 出版日期2010-1