Multiorbital Dirac superconductors and their realization of higher-order topology

Dao-He Ma; Jin An

doi:10.1103/xd9m-7yfh

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Multiorbital Dirac superconductors and their realization of higher-order topology

Dao-He Ma, Jin An

DOI 10.1103/xd9m-7yfh · Physical Review B

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Abstract

Topological nodal superconductors (SCs) have attracted considerable interest due to their gapless bulk excitations and exotic surface states. In this paper, by establishing a general framework of the effective theory for multiorbital SCs in the weak-pairing limit, we realize a class of three-dimensional time-reversal (T) invariant Dirac SCs, with their topologically protected gapless Dirac nodes being located at generic momenta. By introducing T-breaking pairing perturbations, we demonstrate the existence of Majorana hinge modes in these Dirac SCs as evidence of their realization of higher-order topology. We also propose a kind of T-breaking Dirac SCs, whose Dirac nodes possess nonzero even chiralities and so are characterized by surface Majorana arcs.