Enhancement of Josephson Phase Diffusion by Microwaves

Y. Koval; M. V. Fistul; A. V. Ustinov

doi:10.1103/PhysRevLett.93.087004

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Enhancement of Josephson Phase Diffusion by Microwaves

Y. Koval, M. V. Fistul, A. V. Ustinov

DOI 10.1103/PhysRevLett.93.087004 · Physical Review Letters

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Abstract

We report an experimental and theoretical study of the phase diffusion in small Josephson junctions under microwave irradiation. A peculiar enhancement of the phase diffusion by microwaves is observed. The enhancement manifests itself by a pronounced current peak in the current-voltage characteristics. The voltage position Vtop of the peak increases with the power P of microwave radiation as Vtop∝P, while its current amplitude weakly decreases with P. As the microwave frequency increases, the peak feature evolves into Shapiro steps with a finite slope. Our theoretical analysis, taking into account the enhancement of incoherent superconducting current by multiphoton absorption, is in good agreement with experimental data.

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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