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Enhancement of Josephson Phase Diffusion by Microwaves

Koval, Yu; Fistul, Mikhail V.; Ustinov, Alexey V.


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 ${V}_{\mathrm{top}}$ of the peak increases with the power $P$ of microwave radiation as ${V}_{\mathrm{top}} {\propto}\sqrt{P}$, 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.

DOI: 10.1103/PhysRevLett.93.087004
Zitationen: 27
Zitationen: 28
Zugehörige Institution(en) am KIT Physikalisches Institut (PHI)
Publikationstyp Zeitschriftenaufsatz
Publikationsjahr 2004
Sprache Englisch
Identifikator ISSN: 0031-9007, 1079-7114, 1092-0145
KITopen-ID: 1000074283
Erschienen in Physical review letters
Verlag American Physical Society (APS)
Band 93
Heft 8
Seiten Art. Nr. 087004
Nachgewiesen in Scopus
Web of Science
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