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Originalveröffentlichung
DOI: 10.1103/PhysRevLett.93.087004
Scopus
Zitationen: 20
Web of Science
Zitationen: 20

Enhancement of Josephson Phase Diffusion by Microwaves

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

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 ${V}_{\mathrm{top}}$ 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.


Zugehörige Institution(en) am KIT Physikalisches Institut (PHI)
Publikationstyp Zeitschriftenaufsatz
Jahr 2004
Sprache Englisch
Identifikator ISSN: 0031-9007, 1079-7114, 1092-0145
KITopen ID: 1000074283
Erschienen in Physical review letters
Band 93
Heft 8
Seiten Art. Nr. 087004
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