Frustrated Dipole Order Induces Noncollinear Proper Ferrielectricity in Two Dimensions

ORAL

Abstract

Achieving novel physical properties in two-dimensional (2D) materials should enable numerous functionalities in nanoscale devices. In recent years, interest in high-performance 2D ferroelectric materials has also grown rapidly across multiple scientific and engineering disciplines. Here, dioxydihalides MO2X2 materials (where M= Mo and W; X= Cl and Br) are studied based on density functional theory calculations. For dioxydihalides MO2X2 monolayers, we predict that they should display noncollinear ferrielectricity, induced by competing ferroelectric and antiferroelectric softmodes [1]. More importantly, this intrinsic noncollinearity of dipoles generates unique physical properties, such as Z2xZ2 topological domains, atomic-scale dipole vortices/anti-vortices, and negative piezoelectricity. Our investigations should open the door to a new branch of 2D materials in the pursuit of intrinsically strong noncollinear ferrielectricity.

[1] Ling-Fang Lin, Yang Zhang, Adriana Moreo, Elbio Dagotto, and Shuai Dong, Phys. Rev. Lett. 123, 067601 (2019).

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Presenters

  • Ling-fang Lin

    University of Tennessee, Department of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee

Authors

  • Ling-fang Lin

    University of Tennessee, Department of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee

  • Yang Zhang

    University of Tennessee, Department of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee

  • Adriana Moreo

    University of Tennessee, Department of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee

  • Elbio Dagotto

    Department of Physics and Astronomy, University of Tennessee and ORNL, Physics Department, University of Tennessee, University of Tennessee, Department of Physics and Astronomy, University of Tennessee at Knoxville, University of Tennessee, Knoxville, and Oak Ridge National Laboratory, University of Tennessee, Knoxville, Department of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee

  • Shuai Dong

    Southeast University, School of Physics, Southeast University