Ultrafast dynamics of hot electrons and phonons in chemical vapor deposited graphene
學年 101
學期 2
出版（發表）日期 2013-04-01
作品名稱 Ultrafast dynamics of hot electrons and phonons in chemical vapor deposited graphene
作品名稱（其他語言）
著者 Lin, Kuan-Chun; Li, Ming-Yang; Li, L.J.; Ling, D. C.; Chi, C. C.; Chen, Jeng-Chung
單位 淡江大學物理學系
出版者 College Park: American Institute of Physics
著錄名稱、卷期、頁數 Journal of Applied Physics 113(13), 133511(5pages)
摘要 The relaxation dynamics of photoexcited carriers in a chemical vapor deposited graphene transferred on quartz substrate are investigated using ultrafast optical-pump terahertz (THz)-probe spectroscopy. Terahertz transmission through graphene sample is reduced by optical pumping. The change of transmission decays exponentially after the optical pulse. We find the decay time is insensitive to the substrate temperatures from 10~K to 300~K, but increases sublinearly with pump flunce. We model the relaxation process involving electron-phonon coupling together with a set of rate equations to describe the transient responses of quasi-particals and optical phonons. We can fit the observered transient terahertz transmission very well. The extracted carrier temperature follows the same trend of decay time as a function of fluence. High pump fluence can significantly increase the carrier temperature and broaden the carrier distributions, consequently causing the reduction of optical phonon emission efficiency and slowing down cooling rate. The differences of our results in comparison to similar measurements of expitaxial graphene on SiC will be disscussed.
關鍵字
語言 en_US
ISSN 0021-8979 1089-7550
期刊性質 國外
收錄於 SCI
產學合作
通訊作者
審稿制度 是
國別 USA
公開徵稿
出版型式 紙本 電子版
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