Strain-tunable Berry curvature in quasi-two-dimensional chromium telluride

Hang Chi (), Yunbo Ou (), Tim B. Eldred, Wenpei Gao, Sohee Kwon, Joseph Murray, Michael Dreyer, Robert E. Butera, Alexandre C. Foucher, Haile Ambaye, Jong Keum, Alice T. Greenberg, Yuhang Liu, Mahesh R. Neupane, George J. Coster, Owen A. Vail, Patrick J. Taylor, Patrick A. Folkes, Charles Rong, Gen Yin, Roger K. Lake, Frances M. Ross, Valeria Lauter, Don Heiman and Jagadeesh S. Moodera ()
Additional contact information
Hang Chi: Plasma Science and Fusion Center, Massachusetts Institute of Technology
Yunbo Ou: Plasma Science and Fusion Center, Massachusetts Institute of Technology
Tim B. Eldred: North Carolina State University
Wenpei Gao: North Carolina State University
Sohee Kwon: University of California
Joseph Murray: University of Maryland
Michael Dreyer: University of Maryland
Robert E. Butera: Laboratory for Physical Sciences
Alexandre C. Foucher: Massachusetts Institute of Technology
Haile Ambaye: Oak Ridge National Laboratory
Jong Keum: Oak Ridge National Laboratory
Alice T. Greenberg: DEVCOM Army Research Laboratory
Yuhang Liu: University of California
Mahesh R. Neupane: DEVCOM Army Research Laboratory
George J. Coster: DEVCOM Army Research Laboratory
Owen A. Vail: DEVCOM Army Research Laboratory
Patrick J. Taylor: DEVCOM Army Research Laboratory
Patrick A. Folkes: DEVCOM Army Research Laboratory
Charles Rong: DEVCOM Army Research Laboratory
Gen Yin: Georgetown University
Roger K. Lake: University of California
Frances M. Ross: Massachusetts Institute of Technology
Valeria Lauter: Oak Ridge National Laboratory
Don Heiman: Plasma Science and Fusion Center, Massachusetts Institute of Technology
Jagadeesh S. Moodera: Plasma Science and Fusion Center, Massachusetts Institute of Technology

Nature Communications, 2023, vol. 14, issue 1, 1-8

Abstract: 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 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.

Date: 2023
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DOI: 10.1038/s41467-023-38995-4

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