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Cited by 48Thermal properties of materialsThermal Radiation and Cooling TechnologiesThermoelastic and Magnetoelastic Phenomena

Spectrally Resolved Specular Reflections of Thermal Phonons from Atomically Rough Surfaces

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Ravichandran, Navaneetha K., Zhang, Hang, Minnich, Austin J.·2018·Physical Review X
DOI 10.1103/physrevx.8.041004
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Abstract

New experiments provide evidence that terahertz thermal phonons undergo specular surface reflections at room temperature and are sensitive to surface imperfections of just a few atoms, a key insight that is needed for novel methods of controlling heat flow.

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Crossref · 10.1103/physrevx.8.041004

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  • The thermal conductivity exhibits a marked dependence on grating period up to about 10 μm, a value comparable to that observed in other covalent crystals with higher thermal conductivity such as silicon.

    “The thermal conductivity exhibits a marked dependence on grating period up to ∼10 μm, a value comparable to that observed in other covalent crystals with higher thermal conductivity such as silicon60,65.”

    From Origin of high thermal conductivity in disentangled ultra-high molecular weight polyethylene films: ballistic phonons within enlarged crystals (2022) · cites this paper as [65]

    The Experiment section (page unavailable) identifies the measured samples as silicon membranes, and the Results section reports grating-period-dependent thermal conductivity. The Results describe a transition at approximately 20 μm at 80 K, however, rather than establishing the claimed ∼10 μm scale; the copy therefore supports the silicon comparison but not its specific value. (LLM, conf=0.82)

    Experimental — accuracy not yet measured

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Cites

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  41. See Supplemental Material at http://link.aps.org/ supplemental/10.1103/PhysRevX.8.041004 for (i) addi- tional TEM images for membranes M1 and M2, (ii) addi- tional details on the ab initio procedure to extract specularity parameter, (iii) results for membrane M3 (590 nm thick), and (iv) an analysis of prior works with ab initio properties.

Cited by

Sorted by citations

Authors
Ravichandran, N. K., Zhang, H., & Minnich, A. J.
Affiliations
Boston College (US)
ORCID
Venue
Physical Review X
Publisher
American Physical Society (APS)
Published
2018-10-05
Volume
8
Issue
4
ISSN
2160-3308 (ISSN-L)
DOI
10.1103/physrevx.8.041004
OpenAlex
W2895498256
Cited by
48
References
7
Citations by year
2025: 4 · 2024: 5 · 2023: 7 · 2022: 6 · 2021: 11 · 2020: 9 · 2019: 5 · 2018: 1
FWCI
2.43
Type
journal article
Language
en
Open access
Licence
Locations
  • Physical Review X (publishedVersion, cc-by)
  • CaltechAUTHORS (California Institute of Technology) (submittedVersion, cc-by)
  • DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion, cc-by-sa)
Funders
  • National Science Foundation (CBET CAREER 1254213)
  • Resnick Sustainability Institute for Science, Energy and Sustainability, California Institute of Technology
Topics
  • Physical Sciences › Materials Science › Materials Chemistry › Thermal properties of materials
  • Physical Sciences › Engineering › Civil and Structural Engineering › Thermal Radiation and Cooling Technologies
  • Physical Sciences › Engineering › Mechanics of Materials › Thermoelastic and Magnetoelastic Phenomena
Keywords
thermal phonons, specular reflection, surface defects, terahertz phonons, heat flow control, phonon transport

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