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dc.contributor.authorTian, Zhiting
dc.contributor.authorEsfarjani, Keivan
dc.contributor.authorChen, Gang
dc.date.accessioned2014-08-11T13:27:00Z
dc.date.available2014-08-11T13:27:00Z
dc.date.issued2014-06
dc.date.submitted2014-05
dc.identifier.issn1098-0121
dc.identifier.issn1550-235X
dc.identifier.urihttp://hdl.handle.net/1721.1/88650
dc.description.abstractUnderstanding and manipulating coherent phonon transport in solids is of interest both for enhancing the fundamental understanding of thermal transport as well as for many practical applications, including thermoelectrics. In this study, we investigate phonon transmission across Si/Ge superlattices using the Green's function method with first-principles force constants derived from ab initio density functional theory. By keeping the period thickness fixed while changing the number of periods, we show that interface roughness partially destroys coherent phonon transport, especially at high temperatures. The competition between the low-frequency coherent modes and high-frequency incoherent modes leads to an optimum period length for minimum thermal conductivity. To destroy coherence of the low-frequency modes, scattering length scale on the order of period length is required. This finding is useful to guide the design of superlattices to reach even lower thermal conductivity.en_US
dc.description.sponsorshipUnited States. Dept. of Energy. Office of Basic Energy Sciences (Award DE-FG02-09ER46577)en_US
dc.publisherAmerican Physical Societyen_US
dc.relation.isversionofhttp://dx.doi.org/10.1103/PhysRevB.89.235307en_US
dc.rightsArticle is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use.en_US
dc.sourceAmerican Physical Societyen_US
dc.titleGreen's function studies of phonon transport across Si/Ge superlatticesen_US
dc.typeArticleen_US
dc.identifier.citationTian, Zhiting, Keivan Esfarjani, and Gang Chen. “Green’s Function Studies of Phonon Transport Across Si/Ge Superlattices.” Phys. Rev. B 89, no. 23 (June 2014). © 2014 American Physical Societyen_US
dc.contributor.departmentMassachusetts Institute of Technology. Department of Mechanical Engineeringen_US
dc.contributor.mitauthorTian, Zhitingen_US
dc.contributor.mitauthorEsfarjani, Keivanen_US
dc.contributor.mitauthorChen, Gangen_US
dc.relation.journalPhysical Review Ben_US
dc.eprint.versionFinal published versionen_US
dc.type.urihttp://purl.org/eprint/type/JournalArticleen_US
eprint.statushttp://purl.org/eprint/status/PeerRevieweden_US
dc.date.updated2014-07-23T20:47:51Z
dc.language.rfc3066en
dc.rights.holderAmerican Physical Society
dspace.orderedauthorsTian, Zhiting; Esfarjani, Keivan; Chen, Gangen_US
dc.identifier.orcidhttps://orcid.org/0000-0002-3968-8530
mit.licensePUBLISHER_POLICYen_US
mit.metadata.statusComplete


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