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

Author

Listed:
  • Hang Chi

    (Plasma Science and Fusion Center, Massachusetts Institute of Technology
    DEVCOM Army Research Laboratory)

  • 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
    Physical Science Directorate, Oak Ridge National Laboratory)

  • Alice T. Greenberg

    (DEVCOM Army Research Laboratory)

  • Yuhang Liu

    (University of California)

  • Mahesh R. Neupane

    (DEVCOM Army Research Laboratory
    University of California)

  • 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
    Northeastern University)

  • Jagadeesh S. Moodera

    (Plasma Science and Fusion Center, Massachusetts Institute of Technology
    Massachusetts Institute of Technology)

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.

Suggested Citation

  • 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 & , 2023. "Strain-tunable Berry curvature in quasi-two-dimensional chromium telluride," Nature Communications, Nature, vol. 14(1), pages 1-8, December.
    • Handle: RePEc:nat:natcom:v:14:y:2023:i:1:d:10.1038_s41467-023-38995-4
    DOI: 10.1038/s41467-023-38995-4
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    References listed on IDEAS

    as
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    4. Yongxi Ou & Wilson Yanez & Run Xiao & Max Stanley & Supriya Ghosh & Boyang Zheng & Wei Jiang & Yu-Sheng Huang & Timothy Pillsbury & Anthony Richardella & Chaoxing Liu & Tony Low & Vincent H. Crespi & , 2022. "ZrTe2/CrTe2: an epitaxial van der Waals platform for spintronics," Nature Communications, Nature, vol. 13(1), pages 1-9, December.
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    1. Yong Zhong & Cheng Peng & Haili Huang & Dandan Guan & Jinwoong Hwang & Kuan H. Hsu & Yi Hu & Chunjing Jia & Brian Moritz & Donghui Lu & Jun-Sik Lee & Jin-Feng Jia & Thomas P. Devereaux & Sung-Kwan Mo , 2023. "From Stoner to local moment magnetism in atomically thin Cr2Te3," Nature Communications, Nature, vol. 14(1), pages 1-7, December.

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