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Large-bias spectroscopy of Yu-Shiba-Rusinov states in a double quantum dot

Potts, Heidi LU ; Aspegren, Markus LU ; Debbarma, Rousan LU ; Lehmann, Sebastian LU and Thelander, Claes LU (2023) In Nanotechnology 34(13).
Abstract

We have performed tunnel transport spectroscopy on a quantum dot (QD) molecule proximitized by a superconducting contact. In such a system, the scattering between QD spins and Bogoliubov quasiparticles leads to the formation of Yu-Shiba-Rusinov (YSR) states within the superconducting gap. In this work, we investigate interactions appearing when one- and two-electron spin states in a double-QD energetically align with the superconducting gap edge. We find that the inter-dot spin-triplet state interacts considerably stronger with the superconductor than the corresponding singlet, pointing to stronger screening. By forming a ring molecule with a significant orbital contribution to the effective g-factor, we observe interactions of all four... (More)

We have performed tunnel transport spectroscopy on a quantum dot (QD) molecule proximitized by a superconducting contact. In such a system, the scattering between QD spins and Bogoliubov quasiparticles leads to the formation of Yu-Shiba-Rusinov (YSR) states within the superconducting gap. In this work, we investigate interactions appearing when one- and two-electron spin states in a double-QD energetically align with the superconducting gap edge. We find that the inter-dot spin-triplet state interacts considerably stronger with the superconductor than the corresponding singlet, pointing to stronger screening. By forming a ring molecule with a significant orbital contribution to the effective g-factor, we observe interactions of all four spin-orbital one-electron states with the superconductor under a weak magnetic field.

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author
; ; ; and
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
quantum dot, quantum ring, semiconductor, shiba states, superconductor
in
Nanotechnology
volume
34
issue
13
article number
135002
publisher
IOP Publishing
external identifiers
  • scopus:85146886586
  • pmid:36595334
ISSN
0957-4484
DOI
10.1088/1361-6528/aca90e
language
English
LU publication?
yes
id
00c5e47f-1864-493d-b890-9c667bf20a06
date added to LUP
2023-02-10 14:30:00
date last changed
2024-06-28 08:39:06
@article{00c5e47f-1864-493d-b890-9c667bf20a06,
  abstract     = {{<p>We have performed tunnel transport spectroscopy on a quantum dot (QD) molecule proximitized by a superconducting contact. In such a system, the scattering between QD spins and Bogoliubov quasiparticles leads to the formation of Yu-Shiba-Rusinov (YSR) states within the superconducting gap. In this work, we investigate interactions appearing when one- and two-electron spin states in a double-QD energetically align with the superconducting gap edge. We find that the inter-dot spin-triplet state interacts considerably stronger with the superconductor than the corresponding singlet, pointing to stronger screening. By forming a ring molecule with a significant orbital contribution to the effective g-factor, we observe interactions of all four spin-orbital one-electron states with the superconductor under a weak magnetic field.</p>}},
  author       = {{Potts, Heidi and Aspegren, Markus and Debbarma, Rousan and Lehmann, Sebastian and Thelander, Claes}},
  issn         = {{0957-4484}},
  keywords     = {{quantum dot; quantum ring; semiconductor; shiba states; superconductor}},
  language     = {{eng}},
  number       = {{13}},
  publisher    = {{IOP Publishing}},
  series       = {{Nanotechnology}},
  title        = {{Large-bias spectroscopy of Yu-Shiba-Rusinov states in a double quantum dot}},
  url          = {{http://dx.doi.org/10.1088/1361-6528/aca90e}},
  doi          = {{10.1088/1361-6528/aca90e}},
  volume       = {{34}},
  year         = {{2023}},
}