Phonons in Slow Motion: Dispersion Relations in Ultra-Thin Si Membranes
Mesoscale and Nanoscale Physics
2012-09-12 v1
Abstract
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.
Cite
@article{arxiv.1209.2324,
title = {Phonons in Slow Motion: Dispersion Relations in Ultra-Thin Si Membranes},
author = {John Cuffe and Emigdio Chavez and Andrey Shchepetov and P-Olivier Chapuis and El Houssaine El Boudoutie and Francesc Alzina and Timothy Kehoe and Jordi Gomis-Bresco and Damian Dudek and Yan Pennec and Bahram Djafari-Rouhani and Mika Prunnila and Jouni Ahopelto and Clivia. M. Sotomayor Torres},
journal= {arXiv preprint arXiv:1209.2324},
year = {2012}
}
Comments
5 pages