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

Y. Kanai; R. S. Deacon; A. Oiwa; K. Yoshida; K. Shibata; K. Hirakawa; S. Tarucha

doi:10.1103/PhysRevB.82.054512

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

Y. Kanai, R. S. Deacon, A. Oiwa, K. Yoshida, K. Shibata, K. Hirakawa, S. Tarucha

DOI 10.1103/PhysRevB.82.054512 · Physical Review B

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Abstract

We measure the nondissipative 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 an appropriate orbital state. Using the side-gate effect we study the interplay 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.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
InAs Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown
Al Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown