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Physica B Condensed Matter

Charge transport and photon-assisted tunneling in the NSN single-electron transistor

J. M. Hergenrother, Mark T. Tuominen, Jia Grace Lu, Daniel C. Ralph, M. Tinkham

Published Dec 1, 1994• 31 citations
Publisher
DOI
10.1016/0921-4526(94)90077-9

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We have investigated charge transport processes in a superconducting single-electron transistor (S-SET) fabricated in close proximity to a two-dimensional electron gas (2DEG) in a GaAs/AlGaAs heterostructure. The macroscopic bonding pads of the S-SET along with the 2DEG form a microstrip transmission line. We observe a variety of current-carrying cycles in the S-SET which we attribute to simultaneous tunneling of Cooper pairs and emission of photons into the microstrip. We find good agreement between these experimental results and simulations including both photon emission and photon-assisted tunneling due to the electromagnetic environment.