標題: Ultrafast dynamics of coherent optical phonon in a thin film of Bi3Se2Te
作者: Ko, Ying-Kuan
Huang, Yan-Hao
Le, Phuoc Huu
Luo, Chih-Wei
Gospodinov, Marin Mirtchev
Kobayashi, Takayoshi
Yabushita, Atsushi
電子物理學系
Department of Electrophysics
公開日期: 17-八月-2018
摘要: We have performed ultrafast time-resolved spectroscopy of transient absorption for a thin film of Bi3Se2Te, in which recent study result implies the existence of topological surface state. The observed relaxation signal was attributed to the band filling and Auger recombination processes based on the pump power dependence of the signal. After the band filling, bulk-to-surface scattering is thought to proceed being mediated by phonon emission. The dynamics of the phonon was observed from the dumped oscillation appeared on the relaxation curve of the observed signal. The phase of the oscillation indicates that the phonon mode has the period of 519 +/- 3 fs in the electronic excited state. (C) 2018 Elsevier B.V. All rights reserved.
URI: http://dx.doi.org/10.1016/j.chemphys.2018.03.034
http://hdl.handle.net/11536/148011
ISSN: 0301-0104
DOI: 10.1016/j.chemphys.2018.03.034
期刊: CHEMICAL PHYSICS
Volume: 512
起始頁: 62
結束頁: 67
顯示於類別:期刊論文