Non-Hermitian Linear Electrooptic Effect in 3D materials

Here, we present an in-depth theoretical analysis of the linear electrooptic effect in low-symmetry three-dimensional (3D) conductive materials with large Berry curvature dipoles. Our study identifies two distinct kinetic contributions to the linear electrooptic effect: a gyrotropic Hermitian (conse...

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Bibliographic Details
Published inarXiv.org
Main Authors Morgado, Tiago A, Rappoport, Tatiana G, Tsirkin, Stepan S, Lannebère, Sylvain, Souza, Ivo, Silveirinha, Mário G
Format Paper
LanguageEnglish
Published Ithaca Cornell University Library, arXiv.org 24.01.2024
Subjects
Bias
Curvature
Dichroism
Dipoles
First principles
Tellurium
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Summary:Here, we present an in-depth theoretical analysis of the linear electrooptic effect in low-symmetry three-dimensional (3D) conductive materials with large Berry curvature dipoles. Our study identifies two distinct kinetic contributions to the linear electrooptic effect: a gyrotropic Hermitian (conservative) piece and a non-Hermitian term that can originate optical gain. We concentrate on the study of 3D materials belonging to the 32 (\(D_3\)) point group subject to a static electric bias along the trigonal axis. Our investigation shows that doped trigonal tellurium has promising properties, with its gyrotropic electrooptic response offering the potential for realizing electrically-biased electromagnetic isolators and inducing significant optical dichroism. Most notably, it is demonstrated that under sufficiently large static electric bias, tellurium's non-Hermitian electrooptic response may lead to optical gain. Using first-principles calculations, it is shown that n-doped tellurium is particularly promising, as it can host significantly larger Berry curvature dipoles than the more common p-doped tellurium.
ISSN:2331-8422