Direct measurement of room-temperature nondiffusive thermal transport over micron distances in a silicon membrane

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dc.contributor.authorJohnson, Jeremy A.
dc.contributor.authorMaznev, A. A.
dc.contributor.authorCuffe, John
dc.contributor.authorEliason, Jeffrey K.
dc.contributor.authorMinnich, Austin J.
dc.contributor.authorKehoe, Timothy
dc.contributor.authorSotomayor Torres, Clivia M.
dc.contributor.authorChen, Gang
dc.contributor.authorNelson, Keith A.
dc.contributor.funderBasic Energy Sciences
dc.contributor.funderU.S. Department of Energy
dc.contributor.funderSeventh Framework Programme
dc.contributor.funderMinisterio de Economía y Competitividad
dc.contributor.funderGeneralitat de Catalunya
dc.date.accessioned2017-09-04T09:02:30Z
dc.date.available2017-09-04T09:02:30Z
dc.date.issued2013
dc.description.abstractThe "textbook" phonon mean free path of heat carrying phonons in silicon at room temperature is similar to 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 similar to 1-10 mu m. 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. DOI: 10.1103/PhysRevLett.110.025901en
dc.description.sponsorshipU.S. Department of Energy/Basic Energy Sciences (DE-SC0001299/DE-FG02-09ER46577); Ministerio de Economía y Competitividad (ACPHIN, Contract No. FIS2009-150); Generalitat de Catalunya (AGAUR, 2009-SGR-150)en
dc.description.statusPeer revieweden
dc.description.versionPublished Versionen
dc.format.mimetypeapplication/pdfen
dc.identifier.articleid25901
dc.identifier.citationJohnson, J. A., Maznev, A. A., Cuffe, J., Eliason, J. K., Minnich, A. J., Kehoe, T., Torres, C. M. S., Chen, G. and Nelson, K. A. (2013) 'Direct measurement of room-temperature nondiffusive thermal transport over micron distances in a silicon membrane', Physical Review Letters, 110(2), 025901 (5pp). doi: 10.1103/PhysRevLett.110.025901en
dc.identifier.doi10.1103/PhysRevLett.110.025901
dc.identifier.issn0031-9007
dc.identifier.issued2
dc.identifier.journaltitlePhysical Review Lettersen
dc.identifier.urihttps://hdl.handle.net/10468/4621
dc.identifier.volume110
dc.language.isoenen
dc.publisherAmerican Physical Societyen
dc.relation.projectinfo:eu-repo/grantAgreement/EC/FP7::SP1::ICT/257375/EU/Beyond CMOS Nanodevices for Adding Functionalitiesto CMOS/NANOFUNCTION
dc.relation.projectinfo:eu-repo/grantAgreement/EC/FP7::SP1::ICT/233883/EU/TAILoring photon-phonon interaction in silicon PHOXonic crystals/TAILPHOX
dc.relation.projectinfo:eu-repo/grantAgreement/EC/FP7::SP1::ICT/256959/EU/Nanoscale energy management for powering ICT devices/NANOPOWER
dc.relation.urihttps://journals.aps.org/prl/abstract/10.1103/PhysRevLett.110.025901
dc.rights© 2013, American Physical Societyen
dc.subjectThin filmsen
dc.subjectConductionen
dc.subjectScatteringen
dc.subjectGratingsen
dc.subjectDynamicsen
dc.subjectCarrieren
dc.titleDirect measurement of room-temperature nondiffusive thermal transport over micron distances in a silicon membraneen
dc.typeArticle (peer-reviewed)en
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