Unconventional singlet-triplet superconductivity

Abstract

Have you been lying awake wondering what symmetries determine whether a superconductor is spin singlet, triplet, or both? We show that if BCS theory is supplied with additional degrees of freedom, spin singlet can coexist with spin triplet superconductivity. In the first part, we didactically guide the reader to the most general superconducting state using symmetry arguments. If both singlet and triplet pairing channels are present, a magnetic field can convert between spin singlet and triplet states. In the second part, we discuss two possible singlet-triplet superconductors: CeRh${}_2$As${}_2$ and bilayer-NbSe${}_2$.

arXiv commentExtended version of a conference series paper to appear in Journal of Physics: Conference Series (SCES 2020)

References in corpus (5)

• Field-induced transition from even to odd parity superconductivity in CeRh${}_2$As${}_2$
• Ising superconductors: Interplay of magnetic field, triplet channels, and disorder
• s+if pairing in Ising superconductors
• Two scenarios for superconductivity in CeRh${}_2$As${}_2$
• Tunneling spectroscopy of few-monolayer NbSe${}_2$ in high magnetic field: Ising protection and triplet superconductivity

Cited by in corpus (6)

• Coexistence of near-EF flat band and van Hove singularity in a two-phase superconductor
• Multiple superconducting phases in heavy-fermion metals
• Nonreciprocal superconductivity
• Role of the Berry curvature on BCS-type superconductivity in two-dimensional materials
• Superconducting meron phase in locally noncentrosymmetric superconductors
• Multipolar fluctuations from localized 4f electrons in CeRh2As2