Resonant tunneling through a macroscopic charge state in a superconducting SET transistor

Details Resonant tunneling through a macroscopic charge state in a superconducting SET transistor Resonant tunneling through a macroscopic charge state in a superconducting SET transistor

1997-01-30

arxiv.org/abs/cond-mat/9701213v2

Phys. Rev. Lett. 78, 4821 (1997)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

11 pages, 3 figures, Fig. 1 available upon request from the first author

Scientific paper

10.1103/PhysRevLett.78.4821

We predict theoretically and observe in experiment that the differential conductance of a superconducting SET transistor exhibits a peak which is a complete analogue in a macroscopic system of a standard resonant tunneling peak associated with tunneling through a single quantum state. In particular, in a symmetric transistor, the peak height is universal and equal to $e^2/2\pi \hbar$. Away from the resonance we clearly observe the co-tunneling current which in contrast to the normal-metal transistor varies linearly with the bias voltage.

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