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:Ultra-low acoustoelectric attenuation in graphene
學年
學期
出版(發表)日期2017/03/29
作品名稱Ultra-low acoustoelectric attenuation in graphene
作品名稱(其他語言)
著者Chiu-Chun Tang; Yung-Fu Chen; D. C. Ling; C. C. Chi; Jeng-Chung Chen
單位
出版者
著錄名稱、卷期、頁數Journal of Applied Physics 121(12), 124505(5pages)
摘要We investigate the acoustoelectric properties of graphene and extract its acoustoelectric attenuation Γ as a function of the carrier density n, tuned via ionic liquid gating. Acoustoelectric effects in graphene are induced by launching surface acoustic waves (SAWs) on a piezoelectric LiNbO3 substrate. We measure the acoustoelectric current Iae through graphene and extract the SAW attenuation factor Γ as a function of n. The magnitude of Iae increases with decreasing n when the n is far from the charge neutral point (CNP). When n is tuned across the CNP, Iae first exhibits a local maximum, vanishes at the CNP, and then changes sign in accordance with the associated change in the carrier polarity. By contrast, Γ monotonically increases with decreasing n and reaches a maximum at the CNP. The extracted values of Γ, calibrated at the central frequency of 189 MHz, vary from ∼0.4 m−1 to 6.8 m−1, much smaller than the values for known two-dimensional systems. Data analysis suggests that the evolution of Iae and Γ with n manifests the electronic states of graphene. Our experimental findings provide insightful information for developing innovative graphene-based devices.
關鍵字
語言英文(美國)
ISSN0021-8979
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
相關連結
SDGs
  • 產業創新與基礎設施
Google+ 推薦功能,讓全世界都能看到您的推薦!