Publikation: Bloch band dynamics of a Josephson junction in an inductive environment
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2014
Autor:innen
Weißl, Thomas
Matei, Iulian
Pop, Ioan M.
Buisson, Olivier
Hekking, Frank W. J.
Guichard, Wiebke
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Zusammenfassung
We have measured the current-voltage characteristics of a Josephson junction with tunable Josephson energy $E_J$ embedded in an inductive environment provided by a chain of SQUIDs. Such an environment induces localization of the charge on the junction, which results in an enhancement of the zero-bias resistance of the circuit. We understand this result quantitatively in terms of the Bloch band dynamics of the localized charge. This dynamics is governed by diffusion in the lowest Bloch band of the Josephson junction as well as by Landau-Zener transitions out of the lowest band into the higher bands. In addition, the frequencies corresponding to the self-resonant modes of the SQUID array exceed the Josephson energy $E_J$ of the tunable junction, which results in a renormalization of $E_J$, and, as a consequence, of the effective bandwidth of the lowest Bloch band.
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530 Physik
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Physics ; Mesoscopic Systems and Quantum Hall Effect
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WEISSL, Thomas, Gianluca RASTELLI, Iulian MATEI, Ioan M. POP, Olivier BUISSON, Frank W. J. HEKKING, Wiebke GUICHARD, 2014. Bloch band dynamics of a Josephson junction in an inductive environmentBibTex
@unpublished{Weil2014Bloch-29571,
year={2014},
title={Bloch band dynamics of a Josephson junction in an inductive environment},
author={Weißl, Thomas and Rastelli, Gianluca and Matei, Iulian and Pop, Ioan M. and Buisson, Olivier and Hekking, Frank W. J. and Guichard, Wiebke}
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<dcterms:abstract xml:lang="eng">We have measured the current-voltage characteristics of a Josephson junction with tunable Josephson energy $E_J$ embedded in an inductive environment provided by a chain of SQUIDs. Such an environment induces localization of the charge on the junction, which results in an enhancement of the zero-bias resistance of the circuit. We understand this result quantitatively in terms of the Bloch band dynamics of the localized charge. This dynamics is governed by diffusion in the lowest Bloch band of the Josephson junction as well as by Landau-Zener transitions out of the lowest band into the higher bands. In addition, the frequencies corresponding to the self-resonant modes of the SQUID array exceed the Josephson energy $E_J$ of the tunable junction, which results in a renormalization of $E_J$, and, as a consequence, of the effective bandwidth of the lowest Bloch band.</dcterms:abstract>
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