Nature communications · 2023
Strain-tunable Berry curvature in quasi-two-dimensional chromium telluride.
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Chi Hang, Ou Yunbo, Eldred Tim B, Gao Wenpei, Kwon Sohee, Murray Joseph, Dreyer Michael, Butera Robert E, Foucher Alexandre C, Ambaye Haile, Keum Jong, Greenberg Alice T, Liu Yuhang, Neupane Mahesh R, de Coster George J, Vail Owen A, Taylor Patrick J, Folkes Patrick A, Rong Charles, Yin Gen, Lake Roger K, Ross Frances M, Lauter Valeria, Heiman Don, Moodera Jagadeesh S
Аннотация
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 Cr2Te3 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 Cr2Te3 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 Cr2Te3 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 Cr2Te3 thin films offers new opportunities for topological electronics.