Low-Dimensional Noncollinear Ferroelectricity in Group-VI Oxyhalides

ORAL

Abstract

Recently, interest in low-dimensional ferroelectric materials has grown rapidly across multiple scientific and engineering disciplines. Here, a serial group-VI oxyhalides MO3-nX2n is studied based on density functional theory calculations. For n=1, the dioxydihalides display quasi 2D properties with weak vdW interaction between layers. Each layer is predicted to present noncollinear ferrielectricity, induced by competing ferroelectric and antiferroelectric softmodes [1]. This intrinsic noncollinearity of dipoles generates unique physical properties, such as Z2×Z2 topological domains and atomic-scale dipole vortices [1]. For n=2, the dioxytetrahalides display quasi 1D characteristics. The robust ferroelectric distortion within each chain and weak vdW coupling between chains make them candidates for applications as high-density non-volatile memories [2]. Our investigations should open the door to a new branch of low-dimensional materials in the pursuit of intrinsically strong noncollinear ferrielectricity and high-performance functional materials.

[1] L.-F. Lin, et al., Phys. Rev. Lett. 123, 067601 (2019).
[2] L.-F. Lin, et al., Phys. Rev. Materials. 3, 111401(R) (2019).

*DOE, Office of Science, BES, Materials Science and Engineering Division.

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Presenters

  • Ling-Fang Lin

    • University of Tennessee

Authors

  • Ling-Fang Lin

    • University of Tennessee

  • YANG ZHANG

    • University of Tennessee

  • Adriana Moreo

    • University of Tennessee and Oak Ridge National Lab
    • University of Tennessee

  • Elbio Dagotto

    • University of Tennessee
    • Department of Physics and Astronomy, University of Tennesse at Knoxville
    • Physics, University of Tennessee
    • University of Tennessee and ORNL
    • Department of Physics and Astronomy, University of Tennessee
    • Oak Ridge National Lab

  • Shuai Dong

    • Southeast University
    • School of Physics, Southeast University