Nematic electron and phonon dynamics in SnS crystals
學年 111
學期 1
出版(發表)日期 2022-10-24
作品名稱 Nematic electron and phonon dynamics in SnS crystals
著者 Hsueh, Hung-chung
著錄名稱、卷期、頁數 Applied Physics Letters 121(17)
摘要 Tin sulfide (SnS) is one of the promising materials for the applications of optoelectronics and photovoltaics. This study determines the nematic dynamics of photoexcited electrons and phonons in SnS single crystals using polarization-dependent pump–probe spectroscopy at various temperatures. As well as the fast (0.21–1.38 ps) and slow (>5 ps) relaxation processes, a 36–41 GHz coherent acoustic phonon with a sound velocity of 4883 m/s that is generated by the thermoelastic effect is also observed in the transient reflectivity change (DR/R) spectra. Electrons and coherent acoustic phonons show significant in-plane anisotropy from 330 to 430 K due to strong electron–phonon coupling. However, this in-plane anisotropy weakens dramatically in the low-temperature (<330 K) and high-temperature (>430 K) phases. These results add to the knowledge about the anisotropy of electrons and coherent acoustic phonons that give SnS applications in photovoltaic or optoelectronic devices.
關鍵字 Phonons;Nonequilibrium thermodynamics;2D materials;Ultrafast phenomena;Photoexcitations;Pump probe spectroscopy
語言 en_US
ISSN 1077-3118
期刊性質 國外
收錄於 SCI Scopus
通訊作者 Hsueh, Hung-chung; Lue, Chin-shan; Luo, Chih-wei
國別 USA
出版型式 ,電子版,紙本

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