Ultra-low acoustoelectric attenuation in graphene
學年 105
學期 2
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 en_US
ISSN 0021-8979
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
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