| Autor: |
Cuffe, J., Ristow, O., Chávez, E., Shchepetov, A., Chapuis, P-O., Alzina, F., Hettich, M., Prunnila, M., Ahopelto, J., Dekorsy, T., Torres, C. M. Sotomayor |
| Rok vydání: |
2012 |
| Předmět: |
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| Druh dokumentu: |
Working Paper |
| DOI: |
10.1103/PhysRevLett.110.095503 |
| Popis: |
We study the relaxation of coherent acoustic phonon modes with frequencies up to 500 GHz in ultra-thin free-standing silicon membranes. Using an ultrafast pump-probe technique of asynchronous optical sampling, we observe that the decay time of the first-order dilatational mode decreases significantly from \sim 4.7 ns to 5 ps with decreasing membrane thickness from \sim 194 to 8 nm. The experimental results are compared with theories considering both intrinsic phonon-phonon interactions and extrinsic surface roughness scattering including a wavelength-dependent specularity. Our results provide insight to understand some of the limits of nanomechanical resonators and thermal transport in nanostructures. |
| Databáze: |
arXiv |
| Externí odkaz: |
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