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Magneto-optical conductivity of threefold Hopf semimetals

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Abstract

Multifold Hopf semimetals are a new class of topological materials with intriguing electronic band structures characterized by a dipolar Berry curvature. Using a minimal theoretical model and linear response theory, we theoretically investigate the magneto-optical conductivity of threefold Hopf semimetals in the presence of a strong magnetic field by employing the Kubo formula approach in the zero-temperature limit. Our findings reveal that the optical selection rules vary according to the direction of the applied magnetic field with respect to the dipole axis, resulting in a highly anisotropic magneto-optical conductivity that can be utilized as a distinct spectroscopic signature of threefold Hopf semimetals. In particular, it is shown that some types of optical transitions can be prohibited at certain angles, leading to the disappearance of the corresponding peaks of the magneto-optical conductivity. Our research provides insights into the unique magneto-optical characteristics of threefold Hopf semimetals and their potential use for experimental identification.

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Acknowledgements

This work was supported by the National Research Foundation of Korea(NRF) grant funded by the Korea government(MSIT) (No. RS-2023-00272513).

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  1. Department of Physics, Chungbuk National University, Cheongju, 28644, Korea

    Seong** Ahn

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  1. Seong** Ahn
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Correspondence to Seong** Ahn.

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Ahn, S. Magneto-optical conductivity of threefold Hopf semimetals. J. Korean Phys. Soc. 84, 59–66 (2024). https://doi.org/10.1007/s40042-023-00979-4

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  • DOI: https://doi.org/10.1007/s40042-023-00979-4

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