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Spectral properties of a mixed singlet-triplet Ising superconductor

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2023

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Frontiers in Electronic Materials. Frontiers. 2023, 3, 1254302. eISSN 2673-9895. Available under: doi: 10.3389/femat.2023.1254302

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Conventional two-dimensional superconductivity is destroyed when the critical in-plane magnetic field exceeds the so-called Pauli limit. Some monolayer transition-metal dichalcogenides lack inversion symmetry and the strong spin-orbit coupling leads to a valley-dependent Zeeman-like spin splitting. The resulting spin-valley locking lifts the valley degeneracy and results in a strong enhancement of the in-plane critical magnetic field. In these systems, it was predicted that the density of states in an in-plane field exhibits distinct mirage gaps at finite energies of about the spin-orbit coupling strength, which arise from a coupling of the electron and hole bands at energy larger than the superconducting gap. In this study, we investigate the impact of a triplet pairing channel on the spectral properties, primarily the mirage gap and the superconducting gap, in the clean limit. Notably, in the presence of the triplet pairing channel, the mirage-gap width is reduced for the low magnetic fields. Furthermore, when the temperature is lower than the triplet critical temperature, the mirage gaps survive even in the strong-field limit due to the finite singlet and triplet order parameters. Our work provides insights into controlling and understanding the properties of spin-triplet Cooper pairs.

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530 Physik

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Superconductivity, spin-triplet Cooper pairs

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ISO 690PATIL, Sourabh Prakash, Gaomin TANG, Wolfgang BELZIG, 2023. Spectral properties of a mixed singlet-triplet Ising superconductor. In: Frontiers in Electronic Materials. Frontiers. 2023, 3, 1254302. eISSN 2673-9895. Available under: doi: 10.3389/femat.2023.1254302
BibTex
@article{Patil2023Spect-67358,
  year={2023},
  doi={10.3389/femat.2023.1254302},
  title={Spectral properties of a mixed singlet-triplet Ising superconductor},
  volume={3},
  journal={Frontiers in Electronic Materials},
  author={Patil, Sourabh Prakash and Tang, Gaomin and Belzig, Wolfgang},
  note={Article Number: 1254302}
}
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