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

Johnson, Jeremy A. and Maznev, A. A. and Cuffe, John and Eliason, Jeffrey K. and Minnich, Austin J. and Kehoe, Timothy and Sotomayor Torres, Clivia M. and Chen, Gang and Nelson, Keith A. (2013) Direct Measurement of Room-Temperature Nondiffusive Thermal Transport Over Micron Distances in a Silicon Membrane. Physical Review Letters, 110 (2). Art. No. 025901. ISSN 0031-9007. doi:10.1103/physrevlett.110.025901.

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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.

Item Type:Article
Related URLs:
URLURL TypeDescription Paper
Johnson, Jeremy A.0000-0001-9808-7172
Cuffe, John0000-0003-2915-5383
Minnich, Austin J.0000-0002-9671-9540
Sotomayor Torres, Clivia M.0000-0001-9986-2716
Alternate Title:Direct Measurement of Room Temperature Non-diffusive Thermal Transport Over Micron Distances in a Silicon Membrane
Additional Information:© 2013 American Physical Society. Received 29 April 2012; published 8 January 2013. This work was supported as part of the S3TEC Energy Frontier Research Center funded by the U.S. Department of Energy, Office of Basic Energy Sciences under Award No. DE-SC0001299/DE-FG02-09ER46577 (experimental setup and data analysis). This work was also partially supported by projects NANOPOWER, Contract No. 256959; TAILPHOX, Contract No. 233883; NANOFUNCTION, Contract No. 257375; ACPHIN, Contract No. FIS2009-150; and AGAUR, 2009-SGR-150. The samples were fabricated using facilities of the ICTS “Integrated Nano and Microfabrication Clean Room” (CSIC-CNM).
Funding AgencyGrant Number
Department of Energy (DOE)DE-SC0001299
Department of Energy (DOE)DE-FG02-09ER46577
European Research Council (ERC)256959
European Research Council (ERC)233883
European Research Council (ERC)257375
Ministerio de Economía, Industria y Competitividad (MINECO)FIS2009-150
Generalitat de Catalunya2009-SGR-150
Issue or Number:2
Classification Code:PACS numbers: 65.80.-g,, 66.70.Df, 72.25.-b
Record Number:CaltechAUTHORS:20201028-142514455
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:106336
Deposited By: Tony Diaz
Deposited On:29 Oct 2020 15:58
Last Modified:16 Nov 2021 18:53

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