FisMat2017 - Submission - View

Abstract's title: Time-reversal and rotation symmetry breaking superconductivity in Dirac materials
Submitting author: Luca Chirolli
Affiliation: IMDEA Nanoscience Madrid
Affiliation Address: Calle Farady 9, 28012 Cantoblanc Madrid, Spain
Country: Spain
Oral presentation/Poster (Author's request): Oral presentation
Other authors and affiliations: Fernando de Juan (Rudolf Peierls Centre for Theoretical Physics, Oxford, 1 Keble Road, OX1 3NP, UK), Francisco Guinea (IMDEA Nanociencia, Cantoblanco Madrid, Spain, Department of Physics and Astronomy, University of Manchester, Oxford Road, Manchester M13 9PL, UK.)
Abstract

We consider superconductivity in Dirac materials in the odd parity channel with pseudoscalar and vector order parameters that coexist due to their similar critical temperatures and study their coupled theory in the presence of magnetic dopants. We show that the coupling to the dopants favors the condensation of time-reversal symmetry breaking (TRSB) phases, characterized by a condensate magnetization and simultaneous ordering of the dopant moments. We find a rich phase diagram

with TRSB and rotation breaking phases, characterized by peculiar bulk quasiparticles, with Weyl nodes and nodal lines, and distinctive surface properties. These findings may explain recent experiments on Nb-doped Bi2Se3 that have reported signatures of point nodes and the possibility of TRSB superconductivity induced by Nb magnetic moments.