Cited by 423Thermal properties of materialsThermoelastic and Magnetoelastic PhenomenaThermography and Photoacoustic Techniques

Direct Measurement of Room-Temperature Nondiffusive Thermal Transport Over Micron Distances in a Silicon Membrane

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Johnson, Jeremy A., Maznev, A. A., Cuffe, John, Eliason, Jeffrey K., Minnich, Austin J., Kehoe, Timothy, Torres, Clivia M. Sotomayor, Chen, Gang +1 more·2013·Physical Review Letters

Abstract

The "textbook" phonon mean free path of heat carrying phonons in silicon at room temperature is ∼40 nm. However, a large contribution to the thermal conductivity comes from low-frequency phonons with much longer mean free paths. We present a simple experiment demonstrating that room-temperature thermal transport in Si significantly deviates from the diffusion model already at micron distances. Absorption of crossed laser pulses in a freestanding silicon membrane sets up a sinusoidal temperature profile that is monitored via diffraction of a probe laser beam. By changing the period of the thermal grating we vary the heat transport distance within the range ∼1-10 μm. At small distances, we observe a reduction in the effective thermal conductivity indicating a transition from the diffusive to the ballistic transport regime for the low-frequency part of the phonon spectrum.

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  1. A. Henry and G. Chen, J. Comput. Theor. Nanosci. 5, 141 (2008).
  2. See Supplemental Material at http://link.aps.org/ supplemental/10.1103/PhysRevLett.110.025901 for fur- ther information on methods and analysis.

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Authors
Johnson, J. A., Maznev, A. A., Cuffe, J., Eliason, J. K., Minnich, A. J., Kehoe, T., Torres, C. M. S., Chen, G., & Nelson, K. A.
Affiliations
  • Massachusetts Institute of Technology (US)
  • University College Cork (IE)
  • Institut Català de Nanociència i Nanotecnologia (ES)
  • Institució Catalana de Recerca i Estudis Avançats (ES)
Venue
Physical Review Letters
Published
2013-01-08
Volume
110
Issue
2
Pages
025901-025901
ISSN
  • 0031-9007 (ISSN-L)
  • 1079-7114
OpenAlex
W2161591557
Cited by
421
References
28
Citations by year
2026: 15 · 2025: 24 · 2024: 21 · 2023: 13 · 2022: 32 · 2021: 40 · 2020: 27 · 2019: 46 · 2018: 41 · 2017: 38 · 2016: 39 · 2015: 38 · 2014: 30 · 2013: 16 · 2012: 1
FWCI
18.52
Type
journal article
Language
en
Open access
Locations
  • Physical Review Letters (publishedVersion)
  • PubMed (publishedVersion)
  • Arrow@dit (Dublin Institute of Technology) (acceptedVersion)
  • arXiv (Cornell University) (submittedVersion)
  • OSTI OAI (U.S. Department of Energy Office of Scientific and Technical Information) (submittedVersion)
  • CaltechAUTHORS (California Institute of Technology) (submittedVersion)
  • Cork Open Research Archive (University College Cork, Ireland) (submittedVersion)
  • DIGITAL.CSIC (Spanish National Research Council (CSIC)) (submittedVersion, other-oa)
  • DSpace@MIT (Massachusetts Institute of Technology) (submittedVersion, cc-by-nc)
  • Zenodo (CERN European Organization for Nuclear Research) (submittedVersion, other-oa)
  • arXiv (Cornell University)
  • APS
Funders
U.S. Department of Energy
Topics
  • Physical Sciences › Materials Science › Materials Chemistry › Thermal properties of materials
  • Physical Sciences › Engineering › Mechanics of Materials › Thermoelastic and Magnetoelastic Phenomena
  • Physical Sciences › Engineering › Mechanics of Materials › Thermography and Photoacoustic Techniques
Keywords
ballistic thermal transport, low-frequency phonons, phonon mean free path, silicon, thermal conductivity, thermal grating, silicon membranes

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