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Multiterminal transport spectroscopy of subgap states in Coulomb-blockaded superconductors

Souto, Rubén Seoane LU orcid ; Wauters, Matteo M. ; Flensberg, Karsten ; Leijnse, Martin LU and Burrello, Michele (2022) In Physical Review B 106(23).
Abstract

Subgap states are responsible for the low-bias transport features of hybrid superconducting-semiconducting devices. Here we analyze the local and nonlocal differential conductance of Coulomb-blockaded multiterminal superconducting islands that host subgap states with different spatial structures. The emerging patterns of their transport spectroscopy are used to characterize the possible topological nature of these devices and offer the possibility of controlling their transport properties. We develop a next-to-leading order master equation to describe the multiterminal transport in superconductors with both strong Coulomb interactions and multiple subgap states, coupled with metallic leads. We show that the nonlocal differential... (More)

Subgap states are responsible for the low-bias transport features of hybrid superconducting-semiconducting devices. Here we analyze the local and nonlocal differential conductance of Coulomb-blockaded multiterminal superconducting islands that host subgap states with different spatial structures. The emerging patterns of their transport spectroscopy are used to characterize the possible topological nature of these devices and offer the possibility of controlling their transport properties. We develop a next-to-leading order master equation to describe the multiterminal transport in superconductors with both strong Coulomb interactions and multiple subgap states, coupled with metallic leads. We show that the nonlocal differential conductance characterizes the spatial extension of the subgap states and signals the presence of degenerate bound states with a finite support on different parts of the device. Additionally, it displays sharp sign changes as a function of the induced charge of the superconductor, signaling energy crossings among its lowest excited states.

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Please use this url to cite or link to this publication:
author
; ; ; and
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Physical Review B
volume
106
issue
23
article number
235425
publisher
American Physical Society
external identifiers
  • scopus:85145587395
ISSN
2469-9950
DOI
10.1103/PhysRevB.106.235425
language
English
LU publication?
yes
additional info
Funding Information: We acknowledge support from the Danish National Research Foundation, the Danish Council for Independent Research Natural Sciences, the European Research Council (Grant Agreement No. 856526), the Swedish Research Council, and NanoLund. M.M.W. and M.B. are supported by the Villum Foundation (Research Grant No. 25310). This project has received funding from the European Union's Horizon 2020 research and innovation program under the Marie Sklodowska-Curie grant agreement No. 847523 “INTERACTIONS.” Publisher Copyright: © 2022 authors. Published by the American Physical Society.
id
6e2f3455-07bc-4878-bdb5-63d129908904
date added to LUP
2023-01-16 15:26:18
date last changed
2023-11-20 16:55:57
@article{6e2f3455-07bc-4878-bdb5-63d129908904,
  abstract     = {{<p>Subgap states are responsible for the low-bias transport features of hybrid superconducting-semiconducting devices. Here we analyze the local and nonlocal differential conductance of Coulomb-blockaded multiterminal superconducting islands that host subgap states with different spatial structures. The emerging patterns of their transport spectroscopy are used to characterize the possible topological nature of these devices and offer the possibility of controlling their transport properties. We develop a next-to-leading order master equation to describe the multiterminal transport in superconductors with both strong Coulomb interactions and multiple subgap states, coupled with metallic leads. We show that the nonlocal differential conductance characterizes the spatial extension of the subgap states and signals the presence of degenerate bound states with a finite support on different parts of the device. Additionally, it displays sharp sign changes as a function of the induced charge of the superconductor, signaling energy crossings among its lowest excited states.</p>}},
  author       = {{Souto, Rubén Seoane and Wauters, Matteo M. and Flensberg, Karsten and Leijnse, Martin and Burrello, Michele}},
  issn         = {{2469-9950}},
  language     = {{eng}},
  number       = {{23}},
  publisher    = {{American Physical Society}},
  series       = {{Physical Review B}},
  title        = {{Multiterminal transport spectroscopy of subgap states in Coulomb-blockaded superconductors}},
  url          = {{http://dx.doi.org/10.1103/PhysRevB.106.235425}},
  doi          = {{10.1103/PhysRevB.106.235425}},
  volume       = {{106}},
  year         = {{2022}},
}