Phonons in slow motion:Dispersion relations in ultrathin Si membranes
- Cuffe, J.
- Chavez, E.
- Shchepetov, Andrey
- Chapuis, P.-O.
- El Boudouti, E.H.
- Alzina, F.
- Kehoe, T.
- Gomis-Bresco, J.
- Dudek, D.
- Pennec, Y.
- Djafari-Rouhani, B.
- Prunnila, Mika
- Ahopelto, Jouni
- Sotomayor Torres, C.M.
Publication date
January 2012
DOIAbstract
We report the changes in dispersion relations of hypersonic acoustic phonons in free-standing silicon membranes as thin as ∼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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