Observation of Negative Absolute Resistance in a Josephson Junction

J. Nagel; D. Speer; T. Gaber; A. Sterck; R. Eichhorn; P. Reimann; K. Ilin; M. Siegel; D. Koelle; R. Kleiner

doi:10.1103/PhysRevLett.100.217001

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Observation of Negative Absolute Resistance in a Josephson Junction

J. Nagel, D. Speer, T. Gaber, A. Sterck, R. Eichhorn, P. Reimann, K. Ilin, M. Siegel, D. Koelle, R. Kleiner

DOI 10.1103/PhysRevLett.100.217001 · Physical Review Letters

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Abstract

We experimentally demonstrate the occurrence of negative absolute resistance (NAR) up to about −1 Ω in response to an externally applied dc current for a shunted Nb−Al/AlOx−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.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
Nb Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown