Kerr, Faraday, and Magnetoelectric Effects in MnBiTe Thin Films
arXiv:2303.14635 · doi:10.1103/PhysRevB.108.125424
Abstract
The topological magneto-electric effect (TME) is a characteristic property of topological insulators. In this article, we use a simplified coupled-Dirac-cone electronic structure model to theoretically evaluate the THz and far infrared Kerr and Faraday responses of thin films of MnBiTe with up to septuple layers with the goal of clarifying the relationship between these convenient magneto-optical observables and the TME. We find that for even the linear Kerr and Faraday responses to an electric field vanish in the low-frequency limit, even though the magnetoelectric response is large and approximately quantized.
5+7 pages
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