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Phonons in free-standing silicon membranes: an insight into heat transport in the nano scale

AutorSotomayor Torres, C. M.
Fecha de publicación2016
CitaciónIWEPNM 2016
ResumenThe contribution of acoustic phonons to the thermal conductivity is studied in ultrathin free-standing Si membranes. Our understanding so far is based on measured and modelled acoustic phonon dispersion relations, their lifetime, transport in the diffusive and ballistic regimes, the presence of native oxide and of 2-D phononic crystals and the direct in-plane thermal conductivity measurements based on laser-Raman thermometry. The dispersion relations of membranes of thickness down to 8 nm are measured and simulated and found to be discretised flexural and dilatational modes. The group velocity is obtained from these measurements and shown to decrease by a factor larger than 20. The lifetimes of the experimentally accessible first order dilatational mode is observed to decrease over one order of magnitude compared to bulk values. Boundary scattering and normal processes are found to contribute to the thermal transport as well as the native oxide and surface topography.
DescripciónResumen del trabajo presentado al XXXth International Winterschool on Electronics Properties of Novel Materials: "Molecular nanostructures", celebrado en Kirchberg, Tirol (Austria) del 13 al 20 de febrero de 2016.-- In collaboration with: E Chavez-Angel, F Alzina, J S Reparaz, B Graczykowski, A El Sachat, M R Wagner, M Sledzinka , A Shchepetov, M Prunnila and J Ahopelto, J Jaramillo-Fernandez, S Neogi and D Donadio.
URIhttp://hdl.handle.net/10261/161076
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