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VOLUME 86 | ISSUE 3 | PAGE 239
On the possibility of magnetic flux detection by Andreev quantum dot
I. A. Sadovskyy*, G. B. Lesovik*, G. Blatter^\nabla
*L.D. Landau Institute for Theoretical Physics RAS, 117940 Moscow, Russia
^\nablaTheoretische Physik, ETH-Zurich, CH-8093 Zürich, Switzerland


PACS: 73.21.La, 74.45.+c, 07.55.Ge
Abstract
The charge of subgap state in Andreev quantum dot (AQD) inserted into the superconducting loop is very sensitive to the magnetic flux threading the loop. We studied the sensitivity as a function of AQD parameters in details in Δ → ∞ limit. We also accounted for a weak Coulomb interaction in AQD. We discuss a possibility of using this setup as a device detecting week magnetic field.


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