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Broken Screw Rotational Symmetry in the Near-Surface Electronic Structure of $AB$-Stacked Crystals by 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 is a scholarly article available to read on EtoBox.

What is Broken Screw Rotational Symmetry in the Near-Surface Electronic Structure of $AB$-Stacked Crystals about?

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.

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

Published

2023

Language

EN