Skip to main content

Lund University Publications

LUND UNIVERSITY LIBRARIES

Superconductivity in monolayer and few-layer graphene. III. Impurity-induced subgap states and quasiparticle interference patterns

Pangburn, Emile ; Haurie, Louis ; Crépieux, Adeline ; Awoga, Oladunjoye LU ; Black-Schaffer, Annica M. ; Pépin, Catherine and Bena, Cristina (2023) In Physical Review B 108(13).
Abstract
We consider the most energetically favorable symmetry-allowed spin-singlet and spin-triplet superconducting pairing symmetries in monolayer and few-layer graphene and for each calculate the energy spectrum in the presence of a scalar or magnetic impurity. We find that two doubly degenerate subgap states exist for scalar impurities for all types of pairing, except for the spin-singlet s-wave state. For magnetic impurities, two or four subgap states may form depending on the order parameter symmetry. We find that the spin polarization of these states allows one to distinguish between spin-singlet and -triplet pairing; for example, only the spin-triplet states show opposite-energy subgap states with the same spin. We also calculate the... (More)
We consider the most energetically favorable symmetry-allowed spin-singlet and spin-triplet superconducting pairing symmetries in monolayer and few-layer graphene and for each calculate the energy spectrum in the presence of a scalar or magnetic impurity. We find that two doubly degenerate subgap states exist for scalar impurities for all types of pairing, except for the spin-singlet s-wave state. For magnetic impurities, two or four subgap states may form depending on the order parameter symmetry. We find that the spin polarization of these states allows one to distinguish between spin-singlet and -triplet pairing; for example, only the spin-triplet states show opposite-energy subgap states with the same spin. We also calculate the quasiparticle interference patterns associated with the subgap states and find that they exhibit features that could distinguish between different types of pairing symmetries, especially a breaking of rotational symmetry for nodal states, which is stronger for the spin-singlet dxy and dx2−y2 states than for the spin-triplet px and py states. (Less)
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
108
issue
13
article number
134516
publisher
American Physical Society
external identifiers
  • scopus:85177071932
ISSN
2469-9950
DOI
10.1103/PhysRevB.108.134516
language
English
LU publication?
yes
id
ae7cf083-bf42-41b9-a2d3-c8da2dc354d1
date added to LUP
2024-01-02 17:05:15
date last changed
2024-01-08 10:01:10
@article{ae7cf083-bf42-41b9-a2d3-c8da2dc354d1,
  abstract     = {{We consider the most energetically favorable symmetry-allowed spin-singlet and spin-triplet superconducting pairing symmetries in monolayer and few-layer graphene and for each calculate the energy spectrum in the presence of a scalar or magnetic impurity. We find that two doubly degenerate subgap states exist for scalar impurities for all types of pairing, except for the spin-singlet s-wave state. For magnetic impurities, two or four subgap states may form depending on the order parameter symmetry. We find that the spin polarization of these states allows one to distinguish between spin-singlet and -triplet pairing; for example, only the spin-triplet states show opposite-energy subgap states with the same spin. We also calculate the quasiparticle interference patterns associated with the subgap states and find that they exhibit features that could distinguish between different types of pairing symmetries, especially a breaking of rotational symmetry for nodal states, which is stronger for the spin-singlet dxy and dx2−y2 states than for the spin-triplet px and py states.}},
  author       = {{Pangburn, Emile and Haurie, Louis and Crépieux, Adeline and Awoga, Oladunjoye and Black-Schaffer, Annica M. and Pépin, Catherine and Bena, Cristina}},
  issn         = {{2469-9950}},
  language     = {{eng}},
  month        = {{10}},
  number       = {{13}},
  publisher    = {{American Physical Society}},
  series       = {{Physical Review B}},
  title        = {{Superconductivity in monolayer and few-layer graphene. III. Impurity-induced subgap states and quasiparticle interference patterns}},
  url          = {{http://dx.doi.org/10.1103/PhysRevB.108.134516}},
  doi          = {{10.1103/PhysRevB.108.134516}},
  volume       = {{108}},
  year         = {{2023}},
}