Broken Screw Rotational Symmetry in the Near-Surface Electronic Structure of $AB$-Stacked Crystals
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arXiv
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| Autori principali: | , , , , , , , , , , , , |
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| Natura: | Preprint |
| Pubblicazione: |
2023
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| _version_ | 1866909155178053632 |
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| author | Tanaka, Hiroaki Okazaki, Shota Kobayashi, Masaru Fukushima, Yuto Arai, Yosuke Iimori, Takushi Lippmaa, Mikk Yamagami, Kohei Kotani, Yoshinori Komori, Fumio Kuroda, Kenta Sasagawa, Takao Kondo, Takeshi |
| author_facet | Tanaka, Hiroaki Okazaki, Shota Kobayashi, Masaru Fukushima, Yuto Arai, Yosuke Iimori, Takushi Lippmaa, Mikk Yamagami, Kohei Kotani, Yoshinori Komori, Fumio Kuroda, Kenta Sasagawa, Takao Kondo, Takeshi |
| contents | We investigate the electronic structure of $2H$-$\mathrm{Nb}\mathrm{S}_2$ and $h$-$\mathrm{BN}$ by angle-resolved photoemission spectroscopy (ARPES) and photoemission intensity calculations. Although in bulk form, these materials are expected to exhibit band degeneracy in the $k_z=π/c$ plane due to screw rotation and time-reversal symmetries, we observe gapped band dispersion near the surface. We extract from first-principles calculations the near-surface electronic structure probed by ARPES and find that the calculated photoemission spectra from the near-surface region reproduce the gapped ARPES spectra. Our results show that the near-surface electronic structure can be qualitatively different from the bulk one due to partially broken nonsymmorphic symmetries. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2308_00999 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | Broken Screw Rotational Symmetry in the Near-Surface Electronic Structure of $AB$-Stacked Crystals Tanaka, Hiroaki Okazaki, Shota Kobayashi, Masaru Fukushima, Yuto Arai, Yosuke Iimori, Takushi Lippmaa, Mikk Yamagami, Kohei Kotani, Yoshinori Komori, Fumio Kuroda, Kenta Sasagawa, Takao Kondo, Takeshi Materials Science We investigate the electronic structure of $2H$-$\mathrm{Nb}\mathrm{S}_2$ and $h$-$\mathrm{BN}$ by angle-resolved photoemission spectroscopy (ARPES) and photoemission intensity calculations. Although in bulk form, these materials are expected to exhibit band degeneracy in the $k_z=π/c$ plane due to screw rotation and time-reversal symmetries, we observe gapped band dispersion near the surface. We extract from first-principles calculations the near-surface electronic structure probed by ARPES and find that the calculated photoemission spectra from the near-surface region reproduce the gapped ARPES spectra. Our results show that the near-surface electronic structure can be qualitatively different from the bulk one due to partially broken nonsymmorphic symmetries. |
| title | Broken Screw Rotational Symmetry in the Near-Surface Electronic Structure of $AB$-Stacked Crystals |
| topic | Materials Science |
| url | https://arxiv.org/abs/2308.00999 |