Distinguishing nodal and nonunitary superconductivity in quasiparticle interference of an Ising superconductor with Rashba spin-orbit coupling: an example of NbSe$_2$
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arXiv
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| Format: | Preprint |
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2024
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| _version_ | 1866913431337041920 |
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| author | Haniš, Jozef Milivojević, Marko Gmitra, Martin |
| author_facet | Haniš, Jozef Milivojević, Marko Gmitra, Martin |
| contents | The NbSe$_2$ monolayer with Rashba spin-orbit coupling represents a paradigmatic example of an Ising superconductor on a substrate. Using a single-band model and symmetry analysis, we present general superconducting pairing functions beyond the nearest-neighbor approximation, uncovering new types of gap functions, including the nodal singlet gap function and the triplet non-unitary pairing function that breaks time-reversal symmetry. The non-unitarity builts in the asymmetrical band dispersion in the superconducting quasiparticle energy spectra. Performing exact T-matrix calculations of quasiparticle interference due to a single scalar impurity scattering, we found that the interference patterns possess characteristic features distinguishing the type of pairing and possible nematic and chiral symmetry violations. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2407_10498 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Distinguishing nodal and nonunitary superconductivity in quasiparticle interference of an Ising superconductor with Rashba spin-orbit coupling: an example of NbSe$_2$ Haniš, Jozef Milivojević, Marko Gmitra, Martin Superconductivity The NbSe$_2$ monolayer with Rashba spin-orbit coupling represents a paradigmatic example of an Ising superconductor on a substrate. Using a single-band model and symmetry analysis, we present general superconducting pairing functions beyond the nearest-neighbor approximation, uncovering new types of gap functions, including the nodal singlet gap function and the triplet non-unitary pairing function that breaks time-reversal symmetry. The non-unitarity builts in the asymmetrical band dispersion in the superconducting quasiparticle energy spectra. Performing exact T-matrix calculations of quasiparticle interference due to a single scalar impurity scattering, we found that the interference patterns possess characteristic features distinguishing the type of pairing and possible nematic and chiral symmetry violations. |
| title | Distinguishing nodal and nonunitary superconductivity in quasiparticle interference of an Ising superconductor with Rashba spin-orbit coupling: an example of NbSe$_2$ |
| topic | Superconductivity |
| url | https://arxiv.org/abs/2407.10498 |