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Chiral magnetic effect and Maxwell–Chern–Simons electrodynamics in Weyl semimetals

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Abstract

The Weyl semimetal, due to a non-zero energy difference in the pair of Weyl nodes, shows chiral magnetic effect (CME). This leads to a flow of dissipationless electric current along an applied magnetic field. Such a chiral magnetic effect in Weyl semimetals has been studied using the laws of classical electrodynamics. It has been shown that the CME in such a semimetal changes the properties namely, frequency-dependent skin depth, capacitive transport, plasma frequency, etc., in an unconventional way as compared to the conventional metals. In the low-frequency regime, the properties are controlled by a natural length scale due to CME called the chiral magnetic length. Furthermore, unlike the conventional metals, the plasma frequency in this case is shown to be strongly magnetic field-dependent. Since the plasma frequency lies below the optical frequency, the Weyl semimetals will look transparent. Such new and novel observations might help in exploiting these class of materials in potential applications which would completely change the future technology.

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Data Availability Statement

This manuscript has no associated data or the data will not be deposited. [Authors’ comment: This manuscript is a theoretical one and it contains no experimental data.]

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Acknowledgements

The author would like to thank Prof. T. V. Ramakrishnan and Prof. V. S. Subrahmanyam for stimulating discussions and critically reading the manuscript.

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  1. Department of Physics, Institute of Science, Banaras Hindu University, Varanasi, 221 005, India

    Debanand Sa

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Sa, D. Chiral magnetic effect and Maxwell–Chern–Simons electrodynamics in Weyl semimetals. Eur. Phys. J. B 94, 31 (2021). https://doi.org/10.1140/epjb/s10051-020-00042-2

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