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Electrical control of Kondo effect and superconducting transport in a side-gated InAs quantum dot Josephson junction

We measure the non-dissipative supercurrent in a single InAs self-assembled quantum dot (QD) coupled to superconducting leads. The QD occupation is both tuned by a back-gate electrode and lateral side-gate. The geometry of the side-gate allows tuning of the QD-lead tunnel coupling in a region of constant electron number with appropriate orbital state. Using the side-gate effect we study the competition between Kondo correlations and superconducting pairing on the QD, observing a decrease in the supercurrent when the Kondo temperature is reduced below the superconducting energy gap in qualitative agreement with theoretical predictions.

preprint2009arXivOpen access
Y. KanaiR. S. DeaconA. OiwaK. YoshidaK. ShibataK. HirakawaS. Tarucha
cond-mat.mes-hallcond-mat.supr-con
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Open access7 authors2 topics
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Y. KanaiR. S. DeaconA. OiwaK. YoshidaK. ShibataK. HirakawaS. Tarucha

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