Negative Capacitance in a Ferroelectric Capacitor

TL;DR

This paper reports the first direct observation of negative capacitance in a ferroelectric film, revealing unique energy properties that could revolutionize low-power electronics.

Contribution

It provides the first direct measurement of negative capacitance in a ferroelectric material, offering new insights into its energy profile and potential applications.

Findings

Negative capacitance observed in ferroelectric film

Voltage decreases across the capacitor when voltage pulse is applied

Reveals intrinsic energy profile of ferroelectric material

Abstract

The Boltzmann distribution of electrons poses a fundamental barrier to lowering energy dissipation in conventional electronics, often termed as Boltzmann Tyranny. Negative capacitance in ferroelectric materials, which stems from the stored energy of phase transition, could provide a solution, but a direct measurement of negative capacitance has so far been elusive. Here we report the observation of negative capacitance in a thin, epitaxial ferroelectric film. When a voltage pulse is applied, the voltage across the ferroelectric capacitor is found to be decreasing with time-in exactly the opposite direction to which voltage for a regular capacitor should change. Analysis of this inductance-like behavior from a capacitor presents an unprecedented insight into the intrinsic energy profile of the ferroelectric material and could pave the way for completely new applications.