Dynamics of all the Raman-active coherent phonons in Sb2Te3 revealed via transient reflectivity

被引：35

作者：

Norimatsu, Katsura ^{[1
,2
,3
]}

Hada, Masaki ^{[1
,4
]}

Yamamoto, Shuhei ^{[1
]}

Sasagawa, Takao ^{[1
]}

Kitajima, Masahiro ^{[1
,3
]}

Kayanuma, Yosuke ^{[1
,3
]}

Nakamura, Kazutaka G. ^{[1
,3
]}

机构：

[1] Tokyo Inst Technol, Mat & Struct Lab, Yokohama, Kanagawa 2268503, Japan

[2] Japan Soc Promot Sci, Chiyoda Ku, Tokyo 1020083, Japan

[3] Japan Sci & Technol Agcy, CREST, Kawaguchi, Saitama 3320012, Japan

[4] Japan Sci & Technol Agcy, PRESTO, Kawaguchi, Saitama 3320012, Japan

来源：

JOURNAL OF APPLIED PHYSICS | 2015年 / 117卷 / 14期

基金：

日本科学技术振兴机构;

关键词：

SINGLE DIRAC CONE; OPTICAL PHONONS; BI2SE3; BI2TE3;

D O I：

10.1063/1.4917384

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

The phonon dynamics in Sb2Te3 is investigated using femtosecond time-resolved reflection measurements. Time evolution of the reflectivity shows the dynamics of all of the Raman-active optical phonons of Sb2Te3 (A(1g)(1), A(1g)(2), E-g(1), and E-g(2)). The amplitude of these coherent phonons strongly depends on the polarization of the excitation pulse, which can be explained by the analysis based on the Raman tensors. Fine tuning of the polarization enables the observation of even E-g(1) phonons with small amplitude (Delta R/R approximate to 10(-7)) and short decay time (< 1 ps). (C) 2015 AIP Publishing LLC.

引用

页数：6

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