Measuring the quantum states of a mesoscopic SQUID using a small Josephson junction

Details Measuring the quantum states of a mesoscopic SQUID using a small Josephson junction Measuring the quantum states of a mesoscopic SQUID using a small Josephson junction

2003-03-25

arxiv.org/abs/cond-mat/0303536v1

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4 pages, LaTeX (Revtex4)

Scientific paper

10.1103/PhysRevB.68.052506

We have experimentally studied the energy levels of a mesoscopic SQUID using inelastic Cooper-pair tunneling. The tunneling in a small Josephson junction depends strongly on its electromagnetic environment. We use this fact to do energy level spectroscopy of a SQUID-loop by coupling it to a small junction. Our samples with strong quasiparticle dissipation are well described by a model of a particle localized in one of the dips in a cosine-potential, while in the samples with weak dissipation we can see formation of energy bands.

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