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- Title
Static flexural modes and piezoelectricity in 2D and layered crystals.
- Authors
Michel, Karl H.; Neek‐Amal, Mehdi; Peeters, Francois M.
- Abstract
Piezo- and flexoelectricity are manifestations of electromechanical coupling in solids with potential applications in nanoscale materials. Naumov et al. [Phys. Rev. Lett. 102, 217601 (2009)] have shown by first principles calculations that a monolayer BN sheet becomes macroscopically polarized in-plane when in a corrugated state. Here, we investigate the interplay of layer corrugation and in-plane polarization by atomistic lattice dynamics. We treat the coupling between static flexural modes and in-plane atomic ion displacements as an anharmonic effect, similar to the membrane effect that is at the origin of negative thermal expansion in layered crystals. We have derived analytical expressions for the corrugation-induced static in-plane strains and the optical displacements with the resulting polarization response functions. Beyond h-BN, the theory applies to transition metal dichalcogenides and dioxides. Numerical calculations show that the effects are considerably stronger for 2D h-BN than for
- Subjects
PIEZOELECTRICITY; CRYSTALLOGRAPHY; CONDENSED matter physics; PIEZOELECTRIC materials; NANOSTRUCTURED materials
- Publication
Physica Status Solidi (B), 2016, Vol 253, Issue 12, p2311
- ISSN
0370-1972
- Publication type
Article
- DOI
10.1002/pssb.201600226