Subharmonic Shapiro steps and assisted tunneling in superconducting point contacts

Details Subharmonic Shapiro steps and assisted tunneling in superconducting point contacts Subharmonic Shapiro steps and assisted tunneling in superconducting point contacts

2001-09-08

arxiv.org/abs/cond-mat/0109152v1

Phys. Rev. Lett. 88, 157001 (2002)

Physics

Condensed Matter

Superconductivity

Revtex, 4 pages, 4 figures

Scientific paper

10.1103/PhysRevLett.88.157001

We analyze the current in a superconducting point contact of arbitrary transmission in the presence of a microwave radiation. The interplay between the ac Josephson current and the microwave signal gives rise to Shapiro steps at voltages V = (m/n) \hbar \omega_r/2e, where n,m are integer numbers and \omega_r is the radiation frequency. The subharmonic steps (n different from 1) are a consequence of the ocurrence of multiple Andreev reflections (MAR) and provide an unambiguous signature of the peculiar ac Josephson effect at high transmission. Moreover, the dc current exhibits a rich subgap structure due to photon-assisted MARs.

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