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Updated: May 23, 2026

The Frequency Domain Thermoreflectance Technique for Thermal Property Measurements

The Frequency Domain Thermoreflectance Technique for Thermal Property Measurements

Published on: December 5, 2025

Size-dependent phonon transmission across dissimilar material interfaces.

Xiaobo Li¹, Ronggui Yang

¹Department of Mechanical Engineering, University of Colorado, Boulder, CO 80309-0427, USA.

Journal of Physics. Condensed Matter : an Institute of Physics Journal

|March 24, 2012

Summary

Size effects significantly impact phonon transmission across silicon (Si) and germanium (Ge) interfaces. Confinement in layered structures and nanowires alters phonon behavior, offering tunability for advanced material applications.

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Published on: September 26, 2014

Area of Science:

Materials Science
Condensed Matter Physics
Nanotechnology

Background:

Phonon transport across material interfaces is crucial for thermal management in nanodevices.
Understanding size effects is essential for designing materials with tailored thermal properties.

Purpose of the Study:

To investigate the influence of geometric confinement on phonon transmission across silicon/germanium interfaces.
To explore size-dependent phonon behavior in layered and nanowire-like structures.

Main Methods:

Atomistic Green's function (AGF) method applied to model lattice dynamics.
Calculation of phonon transmission coefficients for various Si/Ge configurations.
Validation of the AGF methodology using semi-infinite Si/Ge interfaces.

Main Results:

Phonon transmission is tunable by material mass ratio and structural dimensions.
Longitudinal confinement in superlattices leads to miniband formation and converged transmission after ten periods.
Transverse confinement in Si/Ge nanowires induces unique transmission features (dips and peaks) compared to bulk.

Conclusions:

Phonon transmission is highly sensitive to size confinement in Si/Ge heterostructures.
Nanowire geometry significantly modifies phonon transport compared to bulk interfaces.
The study provides insights into controlling heat flow at the nanoscale through interface engineering.