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Related Experiment Video

Updated: Oct 5, 2025

Characterization of Thermal Transport in One-dimensional Solid Materials

Characterization of Thermal Transport in One-dimensional Solid Materials

Published on: January 26, 2014

Heat Conduction Theory Including Phonon Coherence.

Zhongwei Zhang¹, Yangyu Guo¹, Marc Bescond²

¹Institute of Industrial Science, The University of Tokyo, Tokyo 153-8505, Japan.

Physical Review Letters

|January 21, 2022

Summary

This study introduces a new heat conduction model that includes the wave nature of thermal phonons, going beyond the traditional phonon gas model. It reveals two types of phonon coherence, improving thermal property estimations in solids.

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Area of Science:

Solid-state physics
Condensed matter physics
Thermodynamics

Background:

Quantifying thermal excitation coherence is a fundamental challenge in physics.
The conventional phonon gas model inadequately describes coherence and its effect on thermal transport.

Purpose of the Study:

To develop a general heat conduction formalism incorporating phonon coherence.
To derive a new thermal conductivity expression accounting for wave-like phonon behavior.

Main Methods:

Theoretical arguments and direct atomic simulations were employed.
A formalism was developed introducing wave packets into heat flux calculations.

Main Results:

An original thermal conductivity expression was derived, including coherence and lifetimes.
Two distinct types of coherence (intrinsic and mutual) were identified at different temperatures.

Conclusions:

The proposed formalism provides a fundamental framework for understanding phonon coherence.
This work impacts the accurate estimation of thermal properties in solid materials.