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Time-reversal and rotation symmetry breaking superconductivity in Dirac materials

Luca Chirolli, Fernando de Juan, and Francisco Guinea
Phys. Rev. B 95, 201110(R) – Published 22 May 2017
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Abstract

We consider mixed symmetry superconducting phases in Dirac materials in the odd-parity channel, where pseudoscalar and vector order parameters can coexist due to their similar critical temperatures when attractive interactions are of a finite range. We show that the coupling of these order parameters to unordered magnetic dopants favors the condensation of time-reversal symmetry breaking (TRSB) phases, characterized by a condensate magnetization, rotation symmetry breaking, and simultaneous ordering of the dopant moments. We find a rich phase diagram of mixed TRSB phases characterized by peculiar bulk quasiparticles, with Weyl nodes and nodal lines, and distinctive surface states. These findings are consistent with recent experiments on NbxBi2Se3 that report evidence of point nodes, nematicity, and TRSB superconductivity induced by Nb magnetic moments.

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  • Received 18 November 2016
  • Revised 17 February 2017

DOI:https://doi.org/10.1103/PhysRevB.95.201110

©2017 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

Luca Chirolli1,*, Fernando de Juan1,2, and Francisco Guinea1,3

  • 1IMDEA-Nanoscience, Calle de Faraday 9, E-28049 Madrid, Spain
  • 2Rudolf Peierls Centre for Theoretical Physics, 1 Keble Road, Oxford OX1 3NP, United Kingdom
  • 3Department of Physics and Astronomy, University of Manchester, Oxford Road, Manchester M13 9PL, United Kingdom

  • *luca.chirolli@imdea.org

See Also

Superconductivity-induced ferromagnetism and Weyl superconductivity in Nb-doped Bi2Se3

Noah F. Q. Yuan, Wen-Yu He, and K. T. Law
Phys. Rev. B 95, 201109(R) (2017)

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Vol. 95, Iss. 20 — 15 May 2017

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