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Phonons in slow motion: dispersion relations in ultrathin Si membranes |
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| Authors: | Cuffe John Chávez Emigdio Shchepetov Andrey Chapuis Pierre-Olivier El Boudouti El Houssaine Alzina Francesc Kehoe Timothy Gomis-Bresco Jordi Dudek Damian Pennec Yan Djafari-Rouhani Bahram Prunnila Mika Ahopelto Jouni Sotomayor Torres Clivia M |
| Affiliation: | Catalan Institute of Nanotechnology, Campus UAB, 08193 Bellaterra (Barcelona), Spain. |
| Abstract: | 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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