The topological magnetoelectric effect (TME) is a defining property of three-dimensional Z_{2} topological insulators that was predicted on theoretical grounds more than a decade ago, but has still not been directly measured. In this Letter we propose a strategy for direct measurement of the TME and discuss the precision of the effect in real devices with charge and spin disorder.
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http://dx.doi.org/10.1103/PhysRevLett.133.246607 | DOI Listing |
Phys Rev Lett
December 2024
Department of Physics, University of Texas at Austin, Austin, Texas 78712, USA.
The topological magnetoelectric effect (TME) is a defining property of three-dimensional Z_{2} topological insulators that was predicted on theoretical grounds more than a decade ago, but has still not been directly measured. In this Letter we propose a strategy for direct measurement of the TME and discuss the precision of the effect in real devices with charge and spin disorder.
View Article and Find Full Text PDFNano Lett
December 2024
Guangdong Provincial Key Laboratory of Magnetoelectric Physics and Devices, Center for Neutron Science and Technology, School of Physics, Sun Yat-Sen University, Guangzhou 510275, China.
Sci Rep
November 2024
Key Laboratory for Photonic and Electronic Bandgap Materials, Ministry of Education and School of Physics and Electronic Engineering, Harbin Normal University, Harbin, 150025, China.
We theoretically study the Goos-Hänchen (GH) and Imbert-Fedorov (IF) shifts of a reflected Gaussian beam from a hyperbolic metasurface composed of graphene grating based on topological insulators (TIs). Perturbations are generated on the surface of TIs by applying a thin magnetic film, resulting in a broken time-reversal symmetry. The GH and IF shifts are greatly enhanced as a result of the combined interaction of the graphene grating and the topological magnetoelectric effect (TME).
View Article and Find Full Text PDFNano Lett
December 2024
Department of Applied Physics, Aalto University, 02150 Espoo, Finland.
Twisted magnetic van der Waals materials provide a flexible platform to engineer unconventional magnetism. Here we demonstrate the emergence of electrically tunable topological moiré magnetism in twisted bilayers of the spin-spiral multiferroic NiI. We establish a rich phase diagram featuring uniform spiral phases, a variety of -skyrmion lattices, and nematic spin textures ordered at the moiré scale.
View Article and Find Full Text PDFNano Lett
December 2024
School of Materials, Shenzhen Campus of Sun Yat-Sen University, Shenzhen 518107, China.
Two-dimensional magnets with spontaneous topological spin textures have important application prospects in highly integrated spintronic devices. However, so far, the predicted two-dimensional magnets with topological spin textures are mainly based on transition metals, and most of them are semiconductors or metals. Here, based on first-principles calculations, we predict two-dimensional rare-earth-based half-metallic monolayer GdAN (A = Ge, Sn), with 100% spin polarization.
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