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Magnetic field-induced "mirage" gap in an Ising superconductor

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2021

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Tang, Gaomin
Bruder, Christoph

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Physical Review Letters. merican Physical Society (APS). 2021, 126(23), 237001. ISSN 0031-9007. eISSN 1079-7114. Available under: doi: 10.1103/PhysRevLett.126.237001

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Superconductivity is commonly destroyed by a magnetic field due to orbital or Zeeman-induced pair breaking. Surprisingly, the spin-valley locking in a two-dimensional superconductor with spin-orbit interaction makes the superconducting state resilient to large magnetic fields. We investigate the spectral properties of such an Ising superconductor in a magnetic field taking into account disorder. The interplay of the in-plane magnetic field and the Ising spin-orbit coupling leads to noncollinear effective fields. We find that the emerging singlet and triplet pairing correlations manifest themselves in the occurrence of "mirage" gaps: at (high) energies of the order of the spin-orbit coupling strength, a gap-like structure in the spectrum emerges that mirrors the main superconducting gap. We show that these mirage gaps are signatures of the equal-spin triplet finite-energy pairing correlations and due to their odd parity are sensitive to intervalley scattering.

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ISO 690TANG, Gaomin, Christoph BRUDER, Wolfgang BELZIG, 2021. Magnetic field-induced "mirage" gap in an Ising superconductor. In: Physical Review Letters. merican Physical Society (APS). 2021, 126(23), 237001. ISSN 0031-9007. eISSN 1079-7114. Available under: doi: 10.1103/PhysRevLett.126.237001
BibTex
@article{Tang2021Magne-51893.2,
  year={2021},
  doi={10.1103/PhysRevLett.126.237001},
  title={Magnetic field-induced "mirage" gap in an Ising superconductor},
  number={23},
  volume={126},
  issn={0031-9007},
  journal={Physical Review Letters},
  author={Tang, Gaomin and Bruder, Christoph and Belzig, Wolfgang},
  note={Article Number: 237001}
}
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