Phonons in Slow Motion: Dispersion Relations in Ultrathin Si Membranes
详细信息 查看全文
- 作者：John Cuffe ; Emigdio Ch谩vez ; Andrey Shchepetov ; Pierre-Olivier Chapuis ; El Houssaine El Boudouti ; Francesc Alzina ; Timothy Kehoe ; Jordi Gomis-Bresco ; Damian Dudek ; Yan Pennec ; Bahram Djafari-Rouhani ; Mika Prunnila ; Jouni Ahopelto ; Clivia M. Sotomayor Torres
- 刊名：Nano Letters
- 出版年：2012
- 出版时间：July 11, 2012
- 年：2012
- 卷：12
- 期：7
- 页码：3569-3573
- 全文大小：333K
- 年卷期：v.12,no.7(July 11, 2012)
- ISSN：1530-6992
文摘
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.