Phonons in slow motion: dispersion relations in ultrathin Si membranes.
Nano Lett
; 12(7): 3569-73, 2012 Jul 11.
Article
en En
| MEDLINE
| ID: mdl-22650605
ABSTRACT
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.
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Colección:
01-internacional
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MEDLINE
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En
Revista:
Nano Lett
Año:
2012
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Article
País de afiliación:
España