Umklapp scattering is not necessarily resistive
Name
PhysRevB.98.180302.pdf
Size
1.66 MB
Format
Adobe PDF
Checksum (MD5)
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Author(s)
Ding, Zhiwei
Zhou, Jiawei
Song, Bai
Li, Mingda
Liu, Te Huan
Chen, Gang
Date Issued
November 2018
Journal
Physical Review B
Publisher
American Physical Society
Citation
Ding, Zhiwei et al. "Umklapp scattering is not necessarily resistive." Physical Review B 98, 18 (November 2018): 180302(R) © 2018 American Physical Society
Version
Final published version
Abstract
Since Peierls's pioneering work, it is generally accepted that phonon-phonon scattering processes consist of momentum-conserving normal scatterings and momentum-destroying Umklapp scatterings, and that the latter always induce thermal resistance. We show in this work that Umklapp scatterings are not necessarily resistive—no thermal resistance is induced if the projected momentum is conserved in the direction of heat flow. This distinction is especially important in anisotropic materials such as graphite and black phosphorous. By introducing a direction-dependent definition of normal and Umklapp scattering, we can model thermal transport in anisotropic materials using the Callaway model accurately. This accuracy is physically rooted in the improved description of mode-specific phonon dynamics. With the new definition, we predict that second sound might persist over much longer distances than previously expected.
MIT Department
Massachusetts Institute of Technology. Department of Materials Science and Engineering
Massachusetts Institute of Technology. Department of Mechanical Engineering
Massachusetts Institute of Technology. Department of Nuclear Science and Engineering
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DOI of Published Version
https://doi.org/10.1103/PhysRevB.98.180302
