Quantum confinement of coherent acoustic phonons in transferred single-crystalline bismuth nanofilms
Quantum confinement of coherent acoustic phonons in transferred single-crystalline bismuth nanofilms
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DOI：
10.1063/5.0007168
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发表时间：
2020-06-29
影响因子：
4
通讯作者：
Wang, Yaguo
中科院分区：
文献类型：
--
作者：
He, Feng;Walker, Emily S.;Wang, Yaguo
Coherent acoustic phonon dynamics in single-crystalline bismuth nanofilms transferred to a glass substrate were investigated with ultrafast pump-probe spectroscopy. Coherent phonon signals were substantially enhanced by more than four times when compared with as-grown films on Si (111) substrates. Furthermore, more than 10% reduction of the acoustic phonon velocity was observed when the film thickness decreases to 22nm, which is attributed to the modified phonon dispersion in extremely thin films from quantum confinement effects.
