Subharmonic Shapiro Steps and Assisted Tunneling in Superconducting Point Contacts
J. C. Cuevas, J. Heurich, A. Martín-Rodero, A. Levy Yeyati, G. Schön
DOI 10.1103/PhysRevLett.88.157001 · Physical Review Letters
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Abstract
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)ħωr/2e, where n,m are integer numbers and ωr is the radiation frequency. The subharmonic steps ( n≠1) are a consequence of multiple Andreev reflections (MAR) and provide a 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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