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Strain-tunable Berry curvature in quasi-two-dimensional chromium telluride.
- Source :
- Nature Communications; 6/3/2023, Vol. 14 Issue 1, p1-8, 8p
- Publication Year :
- 2023
-
Abstract
- Magnetic transition metal chalcogenides form an emerging platform for exploring spin-orbit driven Berry phase phenomena owing to the nontrivial interplay between topology and magnetism. Here we show that the anomalous Hall effect in pristine Cr<subscript>2</subscript>Te<subscript>3</subscript> thin films manifests a unique temperature-dependent sign reversal at nonzero magnetization, resulting from the momentum-space Berry curvature as established by first-principles simulations. The sign change is strain tunable, enabled by the sharp and well-defined substrate/film interface in the quasi-two-dimensional Cr<subscript>2</subscript>Te<subscript>3</subscript> epitaxial films, revealed by scanning transmission electron microscopy and depth-sensitive polarized neutron reflectometry. This Berry phase effect further introduces hump-shaped Hall peaks in pristine Cr<subscript>2</subscript>Te<subscript>3</subscript> near the coercive field during the magnetization switching process, owing to the presence of strain-modulated magnetic layers/domains. The versatile interface tunability of Berry curvature in Cr<subscript>2</subscript>Te<subscript>3</subscript> thin films offers new opportunities for topological electronics. Chromium tellurides are a particularly promising family of quasi-2D magnetic materials; towards the single van der Waals layer limit, they preserve magnetic ordering, some even above room temperature, and exhibit a variety of intrinsic topological properties. Here, Hang Chi, Yunbo Ou and co-authors demonstrate a strain tunable Berry curvature induced reversal of the anomalous Hall effect in Cr<subscript>2</subscript>Te<subscript>3</subscript>. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 20411723
- Volume :
- 14
- Issue :
- 1
- Database :
- Complementary Index
- Journal :
- Nature Communications
- Publication Type :
- Academic Journal
- Accession number :
- 164079929
- Full Text :
- https://doi.org/10.1038/s41467-023-38995-4