ac Josephson effect in the resonant tunneling through mesoscopic superconducting junctions

Details ac Josephson effect in the resonant tunneling through mesoscopic superconducting junctions ac Josephson effect in the resonant tunneling through mesoscopic superconducting junctions

2003-02-14

arxiv.org/abs/cond-mat/0302286v1

Phys. Rev. B 69, 024518 (2004)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

11 pages, 3 figures

Scientific paper

10.1103/PhysRevB.69.024518

We investigate ac Josephson effect in the resonant tunneling through mesoscopic superconducting junctions. In the presence of microwave irradiation, we show that the trajectory of multiple Andreev reflections can be closed by emitting or absorbing photons. Consequently, photon-assisted Andreev states are formed and play the role of carrying supercurrent. On the Shapiro steps, dc component appears when the resonant level is near a series of positions with spacing of half of the microwave frequency. Analytical result is derived in the limit of infinite superconducting gap, based on which new features of ac Josephson effect are revealed.

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