DOI: 10.1063/1.4955420. A method for distinguishing between propagons, diffusions, and locons

A method for distinguishing between propagons, diffusions, and locons

10.1063/1.4955420

Crossref journal-article

AIP Publishing

Journal of Applied Physics (317)

Abstract

The majority of intuition on phonon transport has been derived from studies of homogenous crystalline solids, where the atomic composition and structure are periodic. For this specific class of materials, the solutions to the equations of motions for the atoms (in the harmonic limit) result in plane wave modulated velocity fields for the normal modes of vibration. However, it has been known for several decades that whenever a system lacks periodicity, either compositional or structural, the normal modes of vibration can still be determined (in the harmonic limit), but the solutions take on different characteristics and many modes may not be plane wave modulated. Previous work has classified the types of vibrations into three primary categories, namely, propagons, diffusions, and locons. One can use the participation ratio to distinguish locons, from propagons and diffusons, which measures the extent to which a mode is localized. However, distinguishing between propagons and diffusons has remained a challenge, since both are spatially delocalized. Here, we present a new method that quantifies the extent to which a mode's character corresponds to a propagating mode, e.g., exhibits plane wave modulation. This then allows for clear and quantitative distinctions between propagons and diffusons. By resolving this issue quantitatively, one can now automate the classification of modes for any arbitrary material or structure, subject to a single constraint that the atoms must vibrate stably around their respective equilibrium sites. Several example test cases are studied including crystalline silicon and germanium, crystalline silicon with different defect concentrations, as well as amorphous silicon, germanium, and silica.

Bibliography

Seyf, H. R., & Henry, A. (2016). A method for distinguishing between propagons, diffusions, and locons. Journal of Applied Physics, 120(2).

Authors 2

Hamid Reza Seyf (first)
Asegun Henry (additional)

References 20 Referenced 104

10.1115/1.4023585 / J. Heat Transfer (2013)
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10.1103/PhysRevB.90.235201 / Phys. Rev. B (2014)
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Dates

Type	When
Created	9 years, 1 month ago (July 11, 2016, 1 p.m.)
Deposited	2 years, 2 months ago (June 24, 2023, 1:23 p.m.)
Indexed	2 days, 8 hours ago (Aug. 23, 2025, 9:39 p.m.)
Issued	9 years, 1 month ago (July 11, 2016)
Published	9 years, 1 month ago (July 11, 2016)
Published Online	9 years, 1 month ago (July 11, 2016)
Published Print	9 years, 1 month ago (July 14, 2016)

Funders 0

None

BibTeX

@article{Seyf_2016, title={A method for distinguishing between propagons, diffusions, and locons}, volume={120}, ISSN={1089-7550}, url={http://dx.doi.org/10.1063/1.4955420}, DOI={10.1063/1.4955420}, number={2}, journal={Journal of Applied Physics}, publisher={AIP Publishing}, author={Seyf, Hamid Reza and Henry, Asegun}, year={2016}, month=jul }

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