Nonequilibrium Quasiparticles and Periodicity in Single-Cooper-Pair Transistors

Published

February 13, 2004

Author(s)

Joe Aumentado, Mark W. Keller, John M. Martinis, Michel H. Devoret

Abstract

We have made single-Cooper-pair transistors in which we control the spatial profile of the superconducting gap energy by oxygen doping. The profile dramatically affects the switching current vs. gate voltage curve of the transistor, changing its period from 1e to 2e. We observe a 2e period despite "poisoning" by nonequilibrium quasiparticles, a surprising result that is due to the interplay between intrinsic device timescales and measurement bandwidth.

Citation

Physical Review Letters

Volume

92

Issue

6

Pub Type

Journals

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Keywords

Josephson effect, quasiparticle poisoning, single electron transistors, superconductivity

Citation

Aumentado, J. , Keller, M. , Martinis, J. and Devoret, M. (2004), Nonequilibrium Quasiparticles and Periodicity in Single-Cooper-Pair Transistors, Physical Review Letters, [online], https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=31329 (Accessed April 19, 2024)