Phonon renormalization induced by electric field in ferroelectric P(VDF-TrFE) nanofibers

TL;DR

This study demonstrates how an external electric field can induce phonon renormalization in ferroelectric P(VDF-TrFE) nanofibers, enabling control over thermal conductivity through lattice dynamics modifications.

Contribution

It provides experimental and theoretical evidence of electric field-induced phonon renormalization in ferroelectric nanofibers, revealing a new method to manipulate thermal properties.

Findings

Electric field causes phonon spectrum changes in P(VDF-TrFE) nanofibers.

Experimental thermal conductivity measurements match theoretical lattice dynamics.

Electric field offers a tunable approach to control thermal conductivity in ferroelectric materials.

Abstract

We report phonon renormalization induced by an external electric field E in ferroelectric poly(vinylidene fluoride-trifluoroethylene) [P(VDF-TrFE)] nanofibers through measuring the E-dependent thermal conductivity. Our experimental results are in excellent agreement with the theoretical ones derived from the lattice dynamics. The renormalization is attributed to the anharmonicity that modifies the phonon spectrum when the atoms are pulled away from their equilibrium positions by the electric field. Our finding provides an efficient way to manipulate the thermal conductivity by tuning external fields in ferroelectric materials.