Twisted Bogoliubov quasiparticles in the superconducting NbSe$_2$ monolayer on graphene
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arXiv
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| Autores principales: | , , , , |
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| Formato: | Preprint |
| Publicado: |
2024
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| _version_ | 1866913750800400384 |
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| author | Naritsuka, Masahiro Machida, Tadashi Asano, Shun Yanase, Youichi Hanaguri, Tetsuo |
| author_facet | Naritsuka, Masahiro Machida, Tadashi Asano, Shun Yanase, Youichi Hanaguri, Tetsuo |
| contents | The superconducting properties of layered materials can be controlled by thinning, stacking, and twisting, demanding investigation of electronic states by spectroscopic means at the nanometer scale. Here, we reveal the spatial variations of the electronic states in heterostructures of the superconducting monolayer NbSe$_2$/graphene using spectroscopic-imaging scanning tunneling microscopy. The NbSe$_2$ monolayer grown by molecular beam epitaxy is naturally twisted with respect to the graphene substrate and exhibits interference patterns of Bogoliubov quasiparticles twisted with respect to the NbSe$_2$ and graphene lattices. We find that the twisted interference patterns originate from a sextet of regions in momentum space where the Fermi surfaces of NbSe$_2$ and graphene overlap. The Fermi surface overlap is sensitive to the twist angle, providing a knob to tune superconductivity. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2405_14662 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Twisted Bogoliubov quasiparticles in the superconducting NbSe$_2$ monolayer on graphene Naritsuka, Masahiro Machida, Tadashi Asano, Shun Yanase, Youichi Hanaguri, Tetsuo Superconductivity Materials Science The superconducting properties of layered materials can be controlled by thinning, stacking, and twisting, demanding investigation of electronic states by spectroscopic means at the nanometer scale. Here, we reveal the spatial variations of the electronic states in heterostructures of the superconducting monolayer NbSe$_2$/graphene using spectroscopic-imaging scanning tunneling microscopy. The NbSe$_2$ monolayer grown by molecular beam epitaxy is naturally twisted with respect to the graphene substrate and exhibits interference patterns of Bogoliubov quasiparticles twisted with respect to the NbSe$_2$ and graphene lattices. We find that the twisted interference patterns originate from a sextet of regions in momentum space where the Fermi surfaces of NbSe$_2$ and graphene overlap. The Fermi surface overlap is sensitive to the twist angle, providing a knob to tune superconductivity. |
| title | Twisted Bogoliubov quasiparticles in the superconducting NbSe$_2$ monolayer on graphene |
| topic | Superconductivity Materials Science |
| url | https://arxiv.org/abs/2405.14662 |