Quantum Dot Behavior in Graphene Nanoconstrictions

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• 作者：Kathryn Todd ; Hung-Tao Chou ; Sami Amasha ; David Goldhaber-Gordon
• 刊名：Nano Letters
• 出版年：2009
• 出版时间：January 14, 2009
• 年：2009
• 卷：9
• 期：1
• 页码：416-421
• 全文大小：243K
• 年卷期：v.9,no.1(January 14, 2009)
• ISSN：1530-6992

文摘

Graphene nanoribbons display an imperfectly understood transport gap. We measure transport through nanoribbon devices of several lengths. In long (≥250 nm) nanoribbons we observe transport through multiple quantum dots in series, while shorter (≤60 nm) constrictions display behavior characteristic of single and double quantum dots. New measurements indicate that dot size may scale with constriction width. We propose a model where transport occurs through quantum dots that are nucleated by background disorder potential in the presence of a confinement gap.