Journal
PHYSICAL REVIEW LETTERS
Volume 110, Issue 9, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.110.095503
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Funding
- EU [233883, 256959, 216176, 257375]
- Spanish MICINN [FIS2009-10150, CSD2010-00044]
- AGAUR [2009-SGR-150]
- German Research Foundation [DFG SFB767]
- Academy of Finland [252598]
- Irish Research Council for Science, Engineering and Technology (ICRSET)
- Becas Chile CONICYT Fellowship from the Chilean government
- ICREA Funding Source: Custom
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We study the relaxation of coherent acoustic phonon modes with frequencies up to 500 GHz in ultrathin 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 similar to 4.7 ns to 5 ps with decreasing membrane thickness from similar to 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. DOI: 10.1103/PhysRevLett.110.095503
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