Strain Control of Layer-Resolved Negative Capacitance in Superlattices

Authors

Raymond Walter, University of Arkansas, FayettevilleFollow
Sergey Prosandeev, University of Arkansas, FayettevilleFollow
Charles Paillard, Universite Paris-SaclayFollow
L. Bellaiche, University of Arkansas, FayettevilleFollow

Document Type

Article

Publication Date

12-2020

Keywords

Strain (injury); Ferroelectric and Negative Capacitance Devices

Abstract

Negative capacitance in BaTiO₃/SrTiO₃ superlattices is investigated by Monte Carlo simulations in an atomistic effective Hamiltonian model, using fluctuation formulas for responses to the local macroscopic field that incorporates depolarizing fields. We show that epitaxial strain can tune the negative capacitance of the BaTiO₃ ferroelectric layer and the overall capacitance of the system. In addition, we predict and explain an original switching of the negative capacitance from the BaTiO₃ layer to the SrTiO₃ layer at low temperatures for intermediate strains.

Citation

Walter, R., Prosandeev, S., Paillard, C., & Bellaiche, L. (2020). Strain Control of Layer-Resolved Negative Capacitance in Superlattices. npj Computational Materials, 6 (186) https://doi.org/10.1038/s41524-020-00459-4

Creative Commons License

This work is licensed under a Creative Commons Attribution 4.0 International License.