Observation of negative absolute resistance in a Josephson junction

Abstract

We experimentally demonstrate the occurrence of negative absolute resistance (NAR) up to about $-1\Omega$ in response to an externally applied dc current for a shunted Nb-Al/AlO${}_x$-Nb Josephson junction, exposed to a microwave current at frequencies in the GHz range. The realization (or not) of NAR depends crucially on the amplitude of the applied microwave current. Theoretically, the system is described by means of the resistively and capacitively shunted junction model in terms of a moderately damped, classical Brownian particle dynamics in a one-dimensional potential. We find excellent agreement of the experimental results with numerical simulations of the model.

4 pages, 3 figures, submitted to Physical Review

References in corpus (2)

• Absolute negative mobility induced by thermal equilibrium fluctuations
• Anomalous transport in biased ac-driven Josephson junctions: Negative conductances

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