Ultrafast generation and detection of coherent acoustic phonons in SnS0.91Se0.09

被引：5

作者：

Ma, Xiao-Ran ^{[1
]}

Li, Ya-Chao ^{[1
]}

Ge, Chao ^{[1
]}

Wang, Peng ^{[1
]}

Song, Hai-Ying ^{[1
]}

Liu, Shi-Bing ^{[1
]}

机构：

[1] Beijing Univ Technol, Fac Mat & Mfg, Key Lab Transscale Laser Mfg Technol, Strongfield & Ultrafast Photon Lab,Minist Educ, Beijing 100124, Peoples R China

来源：

RESULTS IN PHYSICS | 2023年 / 45卷

关键词：

CAPs; Ultrafast pump-probe; SnS0; 91Se0; 09; Polarization-dependence; HIGH THERMOELECTRIC PERFORMANCE; ELECTRON; DYNAMICS; EXCITATION; ZT;

D O I：

10.1016/j.rinp.2023.106241

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The rapid growth of attention to tin sulfide (SnS) is due to its efficient application in the field of thermoelec-tricity, and its doping product SnS0.91Se0.09 can obtain a high average thermoelectric figure of merit (ZTave approximate to 1.25). Although many efforts have been made to reveal the mechanisms associated with electron transport and heat conduction, the role of lattice vibration remains poorly understood. Here, we studied the coherent vibration dynamics in SnS0.91Se0.09 bulk single crystal by using the femtosecond two-color pump-probe optical reflectivity technique. The oscillation signal in the time domain of SnS0.91Se0.09 is considered to be an electron- phonon interaction. The coherent dynamics of longitudinal acoustic phonons in this coupling behavior is closely related to probe polarization and excitation power. The stability of oscillation frequency reveals the microscopic mechanism of phonon conduction, and further understands the lattice nonharmonic caused by electron-phonon interaction in light-induced.

引用

页数：6