Signatures of triplet correlations in density of states of Ising superconductors

Abstract

The few-layer transition metal dichalcogenides (TMDs) have been recently suggested as a platform for controlled unconventional superconductivity. We study the manifestations of unconventional triplet pairing in the density of states of a disordered TMD based monolayer. The conventional singlet pairing attraction is assumed to be the dominant pairing interaction. We map the phase diagrams of disordered Ising superconductors in the plane of temperature and the in-plane magnetic field. The latter suppresses singlet and promote triplet correlations. The triplet order parameters of a trivial (non-trivial) symmetry compete (cooperate) with the singlet order parameter which gives rise to a rich phase diagram. We locate the model-dependent phase boundaries and compute the order parameters in each of the distinct phases. With this information, we obtain the density of states by solving the Gorkov equation. The triplet components of the order parameters may change an apparent width of the density of states by significantly increasing the critical field. The triplet components of the order parameters lead to the density of states broadening significantly exceeding the broadening induced by magnetic field and disorder in the singlet superconductor.

20 pages, 9 figures

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• Mechanisms of the in-plane magnetic anisotropy in superconducting NbSe2
• Controlling charge and spin transport in an Ising-superconductor Josephson junction
• Spin Transport in Normal Metal-Ising Superconductor Junction
• Proximity-induced gapless superconductivity in two-dimensional Rashba semiconductor in magnetic field
• Spectral properties of disordered Ising superconductors with singlet and triplet pairing in in-plane magnetic fields
• Yu-Shiba-Rusinov States in Ising Superconductors