教師資料查詢 | 類別: 期刊論文 | 教師: 林大欽 LING, DAH-CHIN (瀏覽個人網頁)

標題:Ultrafast dynamics of hot electrons and phonons in chemical vapor deposited graphene
學年
學期
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
語言英文(美國)
ISSN0021-8979;1089-7550
期刊性質國外
收錄於SCI
產學合作
通訊作者
審稿制度
國別美國
公開徵稿
出版型式紙本;電子版
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