Reconstruction of the phonon relaxation times using solutions of the Boltzmann transport equation

TL;DR

This paper introduces a novel method to reconstruct phonon relaxation times directly from thermal spectroscopy data by solving the Boltzmann transport equation, avoiding traditional approximations and demonstrating robustness with synthetic data.

Contribution

It presents a new optimization-based approach for reconstructing phonon relaxation times from thermal data without relying on effective thermal conductivity assumptions.

Findings

Reconstruction accurately recovers synthetic relaxation times.

Method remains robust under noisy data conditions.

Efficient when using analytical solutions of BTE.

Abstract

We present a method for reconstructing the phonon relaxation time distribution $\tau_{\omega}= \tau (\omega)$ (including polarization) in a material from thermal spectroscopy data. The distinguishing feature of this approach is that it does not make use of the effective thermal conductivity concept and associated approximations. The reconstruction is posed as an optimization problem in which the relaxation times $\tau_{\omega}= \tau (\omega)$ are determined by minimizing the discrepancy between the experimental relaxation traces and solutions of the Boltzmann transport equation (BTE) for the same problem. The latter may be analytical, in which case the procedure is very efficient, or numerical. The proposed method is illustrated using Monte Carlo solutions of thermal grating relaxation as synthetic experimental data. The reconstruction is shown to agree very well with the relaxation times used to generate the synthetic Monte Carlo data and remains robust in the presence of uncertainty (noise).