Stochastic Resonance in Thermally Bistable Josephson Weak Links and Micro-SQUIDs
Sagar Paul, Ganesh Kotagiri, Rini Ganguly, Hervé Courtois, Clemens B. Winkelmann, Anjan K. Gupta
DOI 10.1103/PhysRevApplied.15.024009 · Physical Review Applied
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Abstract
Constriction-based Josephson weak links display a thermal bistability between two states exhibiting zero and finite voltages. This manifests in experiments either as hysteresis in the current-voltage characteristics of weak links or as a random telegraphic signal in voltage. In the latter case, a noise-driven amplification of a sinusoidal excitation of the device is observed, at frequencies matching the characteristic switching frequency in the telegraphic signal, a phenomenon known as stochastic resonance. The observed behavior is understood using a two-state model of stochastic resonance and is exploited to illustrate an enhanced signal-to-noise-ratio in a μ-SQUID as a magnetic field sensor.
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| 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 |
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