Anomalous transport in biased ac-driven Josephson junctions: Negative conductances

Details Anomalous transport in biased ac-driven Josephson junctions: Negative conductances Anomalous transport in biased ac-driven Josephson junctions: Negative conductances

2007-12-06

arxiv.org/abs/0712.0893v2

Phys. Rev. B 77 104509 (2008)

Physics

Condensed Matter

Superconductivity

7 pages, 5 figures

Scientific paper

10.1103/PhysRevB.77.104509

We investigate classical anomalous electrical transport in a driven, resistively and capacitively shunted Josephson junction device. Novel transport phenomena are identified in chaotic regimes when the junction is subjected to both, a time periodic (ac) and a constant, biasing (dc) current. The dependence of the voltage across the junction on the dc-current exhibits a rich diversity of anomalous transport characteristics: In particular, depending on the chosen parameter regime we can identify so termed absolute negative conductance around zero dc-bias, the occurrence of negative differential conductance and, after crossing a zero conductance, the emergence of a negative nonlinear conductance in the non-equilibrium response regime remote from zero dc-bias.

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