Journal
NANO LETTERS
Volume 12, Issue 7, Pages 3569-3573Publisher
AMER CHEMICAL SOC
DOI: 10.1021/nl301204u
Keywords
Confined phonons; slow phonons; ultrathin; Si membranes; dispersion relations; inelastic light scattering
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Funding
- EU [233883, 256959, 216176, 257375]
- Spanish MICINN [FIS2009-10150, CSD2010-00044, AGAUR 2009-SGR-150]
- Academy of Finland [252598]
- MICINN
- Irish Research Council for Science, Engineering, and Technology (ICRSET)
- Chilean CONICYT
- ICREA Funding Source: Custom
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We report the changes in dispersion relations of hypersonic acoustic phonons in free-standing silicon membranes as thin as similar to 8 nm. We observe a reduction of the phase and group velocities of the fundamental flexural mode by more than 1 order of magnitude compared to bulk values. The modification of the dispersion relation in nanostructures has important consequences for noise control in nano- and microelectromechanical systems (MEMS/NEMS) as well as opto-mechanical devices.
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