Probing unconventional superconductivity in proximitized graphene by impurity scattering

Oladunjoye A. Awoga and Annica M. Black-Schaffer
Phys. Rev. B 97, 214515 – Published 19 June 2018
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Abstract

We demonstrate how potential impurities are a very powerful tool for determining the pairing symmetry in graphene, proximity coupled to a spin-singlet superconductor. All d-wave states are characterized by subgap resonances, with spatial patterns clearly distinguishing between nodal and chiral d-wave symmetry, while s-wave states have no subgap resonances. We also find strong supergap impurity resonances associated with the normal state Dirac point. Subgap and supergap resonances only interact at very low doping levels, then causing suppression of the supergap resonances.

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  • Received 12 March 2018

DOI:https://doi.org/10.1103/PhysRevB.97.214515

©2018 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

Oladunjoye A. Awoga and Annica M. Black-Schaffer

  • Department of Physics and Astronomy, Uppsala University, Box 516, S-751 20 Uppsala, Sweden

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Issue

Vol. 97, Iss. 21 — 1 June 2018

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