Odd-parity superconductors with two-component order parameters: Nematic and chiral, full gap, and Majorana node

Odd-parity topological superconductor with nematic order: Application to CuxBi2Se3

CuxBi2Se3 was recently proposed as a promising candidate for time-reversal-invariant topological superconductors. In this work, we argue that the unusual anisotropy of the Knight shift observed by Zheng and co-workers (unpublished), taken together with specific heat measurements, provides strong support for an unconventional odd-parity pairing in the two-dimensional Eu representation of the D3d...

Odd-parity topological superconductor with nematic

Three-dimensional Majorana fermions in chiral superconductors

Using a systematic symmetry and topology analysis, we establish that three-dimensional chiral superconductors with strong spin-orbit coupling and odd-parity pairing generically host low-energy nodal quasiparticles that are spin-nondegenerate and realize Majorana fermions in three dimensions. By examining all types of chiral Cooper pairs with total angular momentum J formed by Bloch electrons wi...

Odd parity and line nodes in heavy-fermion superconductors.

Group theory arguments have demonstrated that a general odd parity order parameter cannot have line nodes in the presence of spin-orbit coupling. In this paper, it is shown that these arguments do not hold on the kz = π/c zone face of a hexagonal close packed lattice. In particular, three of the six odd parity representations vanish identically on this face. This has potential relevance to the ...

Interactions for odd-ω gap singlet superconductors

A class of singlet superconductors with a gap function ∆(k, ωn) which is odd in both momentum and Matsubara frequency was proposed recently [1]. To show an instability in the odd gap channel, a model phonon propagator was used with the p-wave interaction strength larger than the s-wave. We argue that the positive scattering matrix element entering the Eliashberg equations leads to a constraint ...