Quantum states of a mesoscopic SQUID measured using a small Josephson junction

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Journal Title
Journal ISSN
Volume Title
School of Science | A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
Date
2003
Major/Subject
Mcode
Degree programme
Language
en
Pages
052506/1-4
Series
Physical Review B, Volume 68, Issue 5
Abstract
We have experimentally studied the energy levels of a mesoscopic superconducting quantum interference device (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.
Description
Keywords
superconducting quantum interference devices, Josephson junctions, Cooper-pair tunneling
Other note
Citation
Lindell, René & Penttilä, Jari & Sillanpää, Mika A. & Hakonen, Pertti. 2003. Quantum states of a mesoscopic SQUID measured using a small Josephson junction. Physical Review B. Volume 68, Issue 5. 052506/1-4. ISSN 1098-0121 (printed). DOI: 10.1103/physrevb.68.052506.