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      Umklapp Scattering and Heat Conductivity of Superlattices

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          Abstract

          The mean free path of phonons in superlattices is estimated. It is shown to be strongly dependent on the superlattice period due to the Umklapp scattering in subbands. It first falls with increasing the superlattice period until it becomes comparable with the latter after what it rises back to the bulk value. Similar behavior is expected of heat conductivity, which is proportional to the mean free path.

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          Minimum Thermal Conductivity of Superlattices

          The phonon thermal conductivity of a multilayer is calculated for transport perpendicular to the layers. There is a cross over between particle transport for thick layers to wave transport for thin layers. The calculations shows that the conductivity has a minimum value for a layer thickness somewhat smaller then the mean free path of the phonons.
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            Phonon group velocity and thermal conduction in superlattices

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              Phonon superlattice transport

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                Author and article information

                Journal
                29 April 2000
                Article
                cond-mat/0005008
                d8968de2-7a42-4a68-80e5-db43e89a0817
                History
                Custom metadata
                Thermoelectric Materials 2000 (MRS Proceedings Volume 626)
                Talk given at MRS meeting, San Francisco, CA, 24-28 April, 2000
                cond-mat.mtrl-sci

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