Domain-Wall Ferroelectric Polarons in a two-dimensional Rotor Lattice Model

TL;DR

This paper presents a theoretical model showing how ferroelectric domain-wall polarons form in a two-dimensional lattice with rotating dipoles, revealing a new type of localized electron state linked to ferroelectric domain walls.

Contribution

It introduces the first theoretical description of ferroelectric polarons in a minimal 2D lattice model with electron-rotor interactions, connecting structural instability and polaron formation.

Findings

Ferroelectric domain-wall polarons can form in a 2D rotor lattice model.

Rotor-electron coupling causes structural instability leading to domain walls.

First theoretical framework for ferroelectric polarons in soft semiconductors.

Abstract

We demonstrate the formation of ferroelectric domain-wall polarons in a minimal two-dimensional lattice model of electrons interacting with rotating dipoles. Along the domain-wall, the rotors polarize in opposite directions, causing the electron to localize along a particular lattice direction. The rotor-electron coupling is identified as the origin of a structural instability in the crystal that leads to the domain-wall formation via a symmetry-breaking process. Our results provide the first theoretical description of ferroelectric polarons, as discussed in the context of soft semiconductors.