Optical Tellegen metamaterial with spontaneous magnetization

Shadi Safaei Jazi, Ihar Faniayeu, Rafael Cichelero, Dimitrios C. Tzarouchis, Mohammad Mahdi Asgari, Alexandre Dmitriev, Shanhui Fan and Viktar Asadchy ()
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Shadi Safaei Jazi: Aalto University
Ihar Faniayeu: University of Gothenburg
Rafael Cichelero: University of Gothenburg
Dimitrios C. Tzarouchis: University of Pennsylvania
Mohammad Mahdi Asgari: Aalto University
Alexandre Dmitriev: University of Gothenburg
Shanhui Fan: Stanford University
Viktar Asadchy: Aalto University

Nature Communications, 2024, vol. 15, issue 1, 1-9

Abstract: Abstract The nonreciprocal magnetoelectric effect, also known as the Tellegen effect, promises a number of groundbreaking phenomena connected to fundamental (e.g., electrodynamics of axion and relativistic matter) and applied physics (e.g., magnetless isolators). We propose a three-dimensional metamaterial with an isotropic and resonant Tellegen response in the visible frequency range. The metamaterial is formed by randomly oriented bi-material nanocylinders in a host medium. Each nanocylinder consists of a ferromagnet in a single-domain magnetic state and a high-permittivity dielectric operating near the magnetic Mie-type resonance. The proposed metamaterial requires no external magnetic bias and operates on the spontaneous magnetization of the nanocylinders. By leveraging the emerging magnetic Weyl semimetals, we further show how a giant bulk effective magnetoelectric effect can be achieved in a proposed metamaterial, exceeding that of natural materials by almost four orders of magnitude.

Date: 2024
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DOI: 10.1038/s41467-024-45225-y

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