Converse Flexoelectricity in van der Waals (vdW) Three-Dimensional Topological Insulator Nanoflakes.

ABSTRACT: Low-dimensional van der Waals (vdW) three-dimensional (3D) topological insulators (TIs) have been overlooked, regarding their electromechanical properties. In this study, we experimentally investigate the electromechanical coupling of low-dimensional 3D TIs with a centrosymmetric crystal structure, where a binary compound, bismuth selenide (Bi₂Se₃), is taken as an example. Piezoresponse force microscopy (PFM) results of Bi₂Se₃ nanoflakes show that the material exhibits both out-of-plane and in-plane electromechanical responses. With careful analyses, the electromechanical responses are verified to arise from the converse flexoelectricity. The Bi₂Se₃ nanoflakes have a decreasing effective out-of-plane piezoelectric coefficien

SUBMITTER: Liu Q 

PROVIDER: S-EPMC11440597 | biostudies-literature | 2024 Sep

REPOSITORIES: biostudies-literature