Disorder-induced exceptional points and nodal lines in Dirac superconductors

Alexander A. Zyuzin*, Pascal Simon

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

20 Citations (Scopus)
199 Downloads (Pure)

Abstract

We consider the effect of disorder on the spectrum of quasiparticles in the point-node and nodal-line superconductors. Due to the anisotropic dispersion of quasiparticles disorder scattering may render the Hamiltonian describing these excitations non-Hermitian. Depending on the dimensionality of the system, we show that the nodes in the spectrum are replaced by Fermi arcs or Fermi areas bounded by exceptional points or exceptional lines, respectively. These features are illustrated by first considering a model of a proximity-induced superconductor in an anisotropic two-dimensional (2D) Dirac semimetal, where a Fermi arc in the gap bounded by exceptional points can be realized. We next show that the interplay between disorder and supercurrents can give rise to a 2D Fermi surface bounded by exceptional lines in three-dimensional (3D) nodal superconductors.

Original languageEnglish
Article number165145
Pages (from-to)1-10
Number of pages10
JournalPhysical Review B
Volume99
Issue number16
DOIs
Publication statusPublished - 29 Apr 2019
MoE publication typeA1 Journal article-refereed

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