Regensburg 2022 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 30: Superconductivity: Poster Session

TT 30.6: Poster

Donnerstag, 8. September 2022, 15:00–18:00, P1

Ising superconductors: the signatures of triplet pairings in the density of states and vanishing of the "mirage" gap — •Sourabh Patil¹, Gaomin Tang², and Wolfgang Belzig¹ — ¹Universität Konstanz, Konstanz, Germany — ²University of Basel, Basel, Switzerland

The conventional 2D superconductors are governed by the critical in-plane magnetic field above which the superconductivity is destroyed. Monolayer transition-metal dichalcogenides lack inversion symmetry and along with a strong spin-orbit coupling, lead to valley-dependent Zeeman-like spin splitting. This is the Ising spin-orbit coupling (ISOC) which then lifts the degeneracy of the two valleys and enhances the in-plane critical magnetic field. The finite energy pairings are thus obtained in such systems. The main superconducting gap-like feature shifted to finite energy is observed and termed a mirage gap.

The triplet pairings are introduced by the applied field. The equal-spin triplet pairing is always coupled to the singlet pairing, reflected in the self-consistent equations. Importantly, as the applied field is increased, we observe that the mirage gap closes (vanishes) and reopens. We obtain a phase diagram for such vanishing of the mirage gap in the 3D parameter space of the applied field, temperature, and the critical triplet temperature, for a fixed ISOC. The role of topology in such a mirage gap closing and any observable physical effects on the superconductivity would be our topic of study.

[1] G. Tang et. al., Phys. Rev. Lett. 126, 237001 (2021)

[2] M. Kuzmanović et. al., arXiv:2104.00328 (2021)