Narrow waveguide based on ferroelectric domain wall

TL;DR

This paper demonstrates that ferroelectric domain walls can serve as waveguides for bound state excitations of electric polarization, enabling potential applications in ferroelectric information processing.

Contribution

It introduces a novel ferroelectric domain wall waveguide supporting bound polarization excitations with unique propagation properties.

Findings

Vibration polar wave has zero frequency gap and propagates within the domain wall.

Domain wall waveguide can host and guide polarization excitations.

Potential for ferroelectric-based information processing devices.

Abstract

Ferroelectric materials are spontaneous symmetry breaking systems characterized by ordered electric polarizations. Similar to its ferromagnetic counterpart, a ferroelectric domain wall can be regarded as a soft interface separating two different ferroelectric domains. Here we show that two bound state excitations of electric polarization (polar wave), or the vibration and breathing modes, can be hosted and propagate within the ferroelectric domain wall. Specially, the vibration polar wave has zero frequency gap, thus is constricted deeply inside ferroelectric domain wall, and can propagate even in the presence of local pinnings. The ferroelectric domain wall waveguide as demonstrated here, offers new paradigm in developing ferroelectric information processing units.