Semiconducting Electronic Structure of the Ferromagnetic Spinel \(\mathbf{Hg}\mathbf{Cr}_2\mathbf{Se}_4\) Revealed by Soft-X-Ray Angle-Resolved Photoemission Spectroscopy

We study the electronic structure of the ferromagnetic spinel \(\mathrm{Hg}\mathrm{Cr}_2\mathrm{Se}_4\) by soft-x-ray angle-resolved photoemission spectroscopy (SX-ARPES) and first-principles calculations. While a theoretical study has predicted that this material is a magnetic Weyl semimetal, SX-AR...

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Bibliographic Details
Published in:arXiv.org 2023-05
Main Authors: Tanaka, Hiroaki, Telegin, Andrei V, Sukhorukov, Yurii P, Golyashov, Vladimir A, Tereshchenko, Oleg E, Lavrov, Alexander N, Matsuda, Takuya, Matsunaga, Ryusuke, Akashi, Ryosuke, Lippmaa, Mikk, Arai, Yosuke, Ideta, Shinichiro, Tanaka, Kiyohisa, Kondo, Takeshi, Kuroda, Kenta
Format: Article
Language:English
Subjects:
Density functional theory
Electronic structure
Energy gap
Ferromagnetic materials
Ferromagnetic phases
First principles
Mathematical analysis
Photoelectric emission
Photoelectron spectroscopy
Selenium
Spinel
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Summary:We study the electronic structure of the ferromagnetic spinel \(\mathrm{Hg}\mathrm{Cr}_2\mathrm{Se}_4\) by soft-x-ray angle-resolved photoemission spectroscopy (SX-ARPES) and first-principles calculations. While a theoretical study has predicted that this material is a magnetic Weyl semimetal, SX-ARPES measurements give direct evidence for a semiconducting state in the ferromagnetic phase. Band calculations based on the density functional theory with hybrid functionals reproduce the experimentally determined band gap value, and the calculated band dispersion matches well with ARPES experiments. We conclude that the theoretical prediction of a Weyl semimetal state in \(\mathrm{Hg}\mathrm{Cr}_2\mathrm{Se}_4\) underestimates the band gap, and this material is a ferromagnetic semiconductor.
ISSN:2331-8422
DOI:10.48550/arxiv.2211.15884