Time-Reversal and rotation symmetry breaking superconductivity in Dirac materials

by Dr Chirolli Luca (IMDEA Nanociencia, Cantoblanco Madrid, Spain)

Tuesday 31 Oct 2017, 11:30 → 12:30 Europe/Rome

Aula Teorici (Dipartimento di Fisica e Astronomia)

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.