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Phonons in Slow Motion: Dispersion Relations in Ultra-Thin Si Membranes

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arxiv 1209.2324 v1 pith:7RVOZQRY submitted 2012-09-11 cond-mat.mes-hall

Phonons in Slow Motion: Dispersion Relations in Ultra-Thin Si Membranes

John Cuffe , Emigdio Chavez , Andrey Shchepetov , P-Olivier Chapuis , El Houssaine El Boudoutie , Francesc Alzina , Timothy Kehoe , Jordi Gomis-Bresco
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Damian Dudek Yan Pennec Bahram Djafari-Rouhani Mika Prunnila Jouni Ahopelto Clivia. M. Sotomayor Torres
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classification cond-mat.mes-hall
keywords dispersionmembranesphononsrelationsacousticbulkchangescompared
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We report the changes in dispersion relations of hypersonic acoustic phonons in free-standing silicon membranes as thin as \sim 8 nm. We observe a reduction of the phase and group velocities of the fundamental flexural mode by more than one order of magnitude compared to bulk values. The modification of the dispersion relation in nanostructures has important consequences for noise control in nano and micro-electromechanical systems (MEMS/NEMS) as well as opto-mechanical devices.

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