Investigating Charge and Vorticity in the Cooper Pair Transistor using RF Reflectometry (SP Workshop)

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• Mr Vivek Chidambaram, University of Cambridge, Semiconductor Physics Group
• Wednesday 11 November 2015, 14:15-15:15
• Mott Seminar Room (Mott Building Room 531), Cavendish Laboratory.

If you have a question about this talk, please contact Teri Bartlett.

A Cooper pair transistor (CPT) consists of a superconducting island coupled to leads only by tunnel barriers. Ordinarily, quasiparticles moving through the island can only exist above the superconducting gap, but entry of superconducting vortices create a sub-gap density of quasiparticle states on the island, modifying the quasiparticle dynamics. This and other interactions of these two objects, for example trapping of a single quasiparticle in a vortex, allows the dynamics of one to be inferred from measurements of the other. CPTs are being fabricated with a view to monitor the quasiparticle tunnelling rates using radio frequency reflectometry at zero and low vorticity. RF reflectometry enables rapid read-out of the island quasiparticle states and with sufficient bandwidth may even allow time-domain resolution of single quasiparticle tunnelling events. In this talk I will summarise the theory of quasiparticles and vortices on CPTs, explain the RF reflectometry technique and show the current progress towards fabricating suitable devices for this experiment.

This talk is part of the Semiconductor Physics Group Seminars series.

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• All Cavendish Laboratory Seminars
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• Mott Seminar Room (Mott Building Room 531), Cavendish Laboratory
• Neurons, Fake News, DNA and your iPhone: The Mathematics of Information
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