Broken Screw Rotational Symmetry in the Near-Surface Electronic Structure of $AB$-Stacked Crystals
| Autor: | 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 |
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| Rok vydání: | 2023 |
| Předmět: | |
| Zdroj: | Phys. Rev. Lett. 132, 136402 (2024) |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1103/PhysRevLett.132.136402 |
| Popis: | 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 $k_z=\pi/c$ 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. Comment: 6+13 pages, 4+15 figures |
| Databáze: | arXiv |
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