Probing hybridization of a single energy level coupled to superconducting leads

D. M. T. van Zanten; F. Balestro; H. Courtois; C. B. Winkelmann

doi:10.1103/PhysRevB.92.184501

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Probing hybridization of a single energy level coupled to superconducting leads

D. M. T. van Zanten, F. Balestro, H. Courtois, C. B. Winkelmann

DOI 10.1103/PhysRevB.92.184501 · Physical Review B

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Abstract

Electron transport through a quantum dot coupled to superconducting leads shows a sharp conductance onset when a quantum dot orbital level crosses the superconducting coherence peak of one lead. We study superconducting single electron transistors in the weak coupling limit by connecting individual gold nanoparticles with aluminum leads formed by electromigration. We show that the transport features close to the conductance onset threshold can be accurately described by the quantum dot levels' hybridization with the leads, which is strongly enhanced by the divergent density of states at the superconducting gap edge. This highlights the importance of electron cotunneling effects in spectroscopies with superconducting probes.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
Au 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