AC Josephson effect and resonant Cooper pair tunneling emission of a Cooper Pair Transistor

Details AC Josephson effect and resonant Cooper pair tunneling emission of a Cooper Pair Transistor AC Josephson effect and resonant Cooper pair tunneling emission of a Cooper Pair Transistor

2006-09-29

arxiv.org/abs/cond-mat/0609755v4

Phys. Rev. Lett. 98, 216802 (2007)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

Revtex4, 5 pages, 4 figures, final version

Scientific paper

10.1103/PhysRevLett.98.126802

We measure the high-frequency emission of a single Cooper pair transistor(SCPT) in the regime where transport is only due to tunneling of Cooper pairs. This is achieved by coupling on-chip the SCPT to a superconductor-insulator-superconductor junction and by measuring the photon assisted tunneling current of quasiparticles across the junction. This technique allows a direct detection of the AC Josephson effect of the SCPT and provides evidence of Landau-Zener transitions for proper gate voltage. The emission in the regime of resonant Cooper pair tunneling is also investigated. It is interpreted in terms of transitions between charge states coupled by the Josephson effect.

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