Observation of an Electron Pocket Around Time-Reversal Invariant L Point in Chiral α-RhSn4 by Means of Nano-ARPES

We have investigated electronic structure of α-RhSn4, which are proposed to harbor Kramers–Weyl fermions, by means of angle-resolved photoemission spectroscopy with submicron beam spot (nano-ARPES). Although α-RhSn4 does not have a well-defined cleavage plane, the small beam spot enabled us to selec...

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Bibliographic Details
Published in:Journal of the Physical Society of Japan 2024-09, Vol.93 (9), p.1
Main Authors: Hayashi, Genki, Hattori, Masaki, Nakamura, Naoki, Higashinaka, Ryuji, Matsuda, Tatsuma D, Aoki, Yuji, Kopciuszynski, Marek, Barinov, Alexey, Saini, Naurang L, Mizokawa, Takashi
Format: Article
Language:English
Subjects:
Electronic structure
Fermi surfaces
Fermions
Photoelectric emission
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Summary:We have investigated electronic structure of α-RhSn4, which are proposed to harbor Kramers–Weyl fermions, by means of angle-resolved photoemission spectroscopy with submicron beam spot (nano-ARPES). Although α-RhSn4 does not have a well-defined cleavage plane, the small beam spot enabled us to select a flat part of the fractured surface and observe band dispersions. The ε Fermi surface discovered by de Haas–van Alphen experiments by Nakamura et al. [J. Phys. Soc. Jpn. 92, 034701 (2023)] is observed by nano-ARPES around L point. The width of the ε band is larger than the prediction of band structure calculations indicating its downward shift from the calculated result. The bottom of the ε band corresponds to a Kramers–Weyl point which is not clearly resolved due to the considerable spectral broadening.
ISSN:0031-9015
1347-4073
DOI:10.7566/JPSJ.93.094706