Broken Screw Rotational Symmetry in the Near-Surface Electronic Structure of AB-Stacked Crystals.
Phys Rev Lett
; 132(13): 136402, 2024 Mar 29.
Article
em En
| MEDLINE
| ID: mdl-38613311
ABSTRACT
We investigate the electronic structure of 2H-NbS_{2} and h-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 electronic structure due to partially broken nonsymmorphic symmetries.
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MEDLINE
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Ano de publicação:
2024
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Article