# Spectral Symmetry Breaking of Electro-Acoustic Noise in Ferroelectric Materials

## TL;DR

This paper introduces a theoretical framework explaining how spectral symmetry breaking in electro-acoustic noise occurs in ferroelectric materials due to thermal fluctuations, leading to enhanced narrowband noise modes.

## Contribution

It provides a novel analytical formulation for electro-acoustic noise generation in ferroelectrics, highlighting the role of spectral feedback and symmetry breaking, which was not previously understood.

## Key findings

- Spectral symmetry breaking leads to high amplitude narrowband noise.
- Feedback mechanisms differ from Johnson-Nyquist noise in conductors.
- Theoretical framework based on fluctuation-dissipation theorem explains the phenomenon.

## Abstract

We present a novel analytical formulation on generation of electro-acoustic noise in ferroelectric materials where the thermal fluctuations induced polarization and acoustic modes distinctly contribute to noise. The conservative force fields associated with ferroelectric materials drive feedback of the spectral modes in the system. It results in symmetry breaking of the frequency spectrum of broadband noise leading to enhancement of specific modes which generate high amplitude narrowband noise. We describe the process under the theoretical framework of fluctuation-dissipation theorem in the context of ferroelectric materials. We further note that such spectral feedback are absent in Johnson-Nyquist noise generation in conductors which have spectral symmetry.