Achieving the threshold regime with an over-screened Josephson junction

Details Achieving the threshold regime with an over-screened Josephson junction Achieving the threshold regime with an over-screened Josephson junction

2008-08-26

arxiv.org/abs/0808.3465v2

Phys. Rev. Lett. 102, 086806 (2009)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4 pages, 1 figure; published version

Scientific paper

10.1103/PhysRevLett.102.086806

We demonstrate that by utilizing an over-screened Josephson junction as a noise detector it is possible to achieve the threshold regime, whereby the tails of the fluctuating current distribution are measured. This situation is realized by placing the Josephson junction and mesoscopic conductor in an external circuit with very low impedance. In the underdamped limit, over-screening the junction inhibits the energy diffusion in the junction, effectively creating a tunable activation barrier to the dissipative state. As a result, the activation rate is qualitatively different from the Arrhenius form.

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