Nodal S-wave Superconductivity in Antiferromagnetic Semimetals

Abstract

We investigate the impact of s-wave spin-singlet pairing on antiferromagnetic semimetals with Dirac points or nodal loops at the Fermi level. The electron pairing is generally shown to convert the semimetal into a tunable nodal superconductor. The changeover from fully gapped to gapless phases is dictated by symmetry properties of the antiferromagnetic-superconducting state that set the occurrence of a large variety of electronic topological transitions. We provide a general criterion for predicting a series of transitions between nodal and fully gapped superconducting phases. Different types of antiferromagnetic patterns are then employed to explicitly demonstrate the microscopic mechanisms that control the character of the quasiparticle spectrum. These findings unveil a novel type of nodal superconductivity emerging from the interplay of Dirac fermions and conventional forms of ordering.

8 pages, 4 figures

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Cited by in corpus (8)

• Inter-orbital topological superconductivity in spin-orbit coupled superconductors with inversion symmetry breaking
• Antiferromagnetism-driven two-dimensional topological nodal-point superconductivity
• Quantum coherence in a compass chain under an alternating magnetic field
• Spin, orbital and topological order in models of strongly correlated electrons
• Topological signatures of the coexistence of antiferromagnetism and odd-parity spin-triplet superconductivity
• Movable but not removable band degeneracies in a symmorphic crystal
• Spin Signature of Majorana Fermions in Topological Nodal-Point Superconductors
• Topological phase transitions in superconductors with chiral symmetry