Transition-state-theory-based interpretation of Landau double well potential for ferroelectrics

TL;DR

This paper uses transition-state theory with the Landau model to unify various ferroelectric models and clarifies that negative capacitance is not predicted, addressing controversies in the field.

Contribution

It introduces a transition-state-theory-based interpretation of the Landau model, linking multiple models and clarifying the non-existence of negative capacitance.

Findings

Connects Landau, first-principles, Preisach, and nucleation models

Shows Landau model with transition-state theory does not predict negative capacitance

Clarifies controversy over quasi-static negative capacitance in ferroelectrics

Abstract

Existence of quasi-static negative capacitance (QSNC) was proposed from an interpretation of the widely accepted Landau model of ferroelectrics. However, many works showed not to support the QSNC theory, making it controversial. In this letter we show the Landau model when used together with transition-state-theory, can connect various models including first-principles, Landau, Preisach and nucleation limited switching while it does not predict the existence of QSNC.