關鍵字查詢 | 類別:期刊論文 | | 關鍵字:Ultra-low acoustoelectric attenuation in graphene

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1 105/2 物理系 林大欽 教授 期刊論文 發佈 Ultra-low acoustoelectric attenuation in graphene , [105-2] :Ultra-low acoustoelectric attenuation in graphene期刊論文Ultra-low acoustoelectric attenuation in grapheneChiu-Chun Tang; Yung-Fu Chen; D. C. Ling; C. C. Chi; Jeng-Chung ChenJournal of Applied Physics 121(12), 124505(5pages)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 maxi
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