Kondo effect in defect-bound quantum dots coupled to NbSe2

T. R. Devidas, Tom Dvir, Enrico Rossi, Hadar Steinberg

Research output: Contribution to journalArticlepeer-review

Abstract

We report the fabrication of a van der Waals tunneling device hosting a defect-bound quantum dot coupled to NbSe2. We find that upon application of a magnetic field, the device exhibits a zero-bias conductance peak. The peak, which splits at higher fields, is associated with a Kondo effect. At the same time, the junction retains conventional quasiparticle tunneling features at finite bias. Such coexistence of a superconducting gap and a Kondo effect are unusual, and are explained by noting the two-gap nature of the superconducting state of NbSe2, where a magnetic field suppresses the low-energy gap associated with the Se band. Our data shows that van der Waals architectures, and defect-bound dots in them, can serve as an effective platform for investigating the interplay of Kondo screening and superconducting pairing in unconventional superconductors.

Original languageEnglish
Article number094502
JournalPhysical Review B
Volume107
Issue number9
DOIs
StatePublished - 1 Mar 2023
Externally publishedYes

Bibliographical note

Publisher Copyright:
© 2023 American Physical Society.

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