1.
Nano Lett
; 12(7): 3569-73, 2012 Jul 11.
Artículo
en Inglés
| MEDLINE
| ID: mdl-22650605
RESUMEN
We report the changes in dispersion relations of hypersonic acoustic phonons in free-standing silicon membranes as thin as â¼8 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.