signature=6ed65a8465c6dde82401c00d9f9aa673,Signatures of single quantum dots in graphene nanoribbons...

St.Helena

于 2021-05-30 01:02:48 发布

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文章标签： signature=6ed65a8465c6dde82401c00d9f9aa673

研究揭示了在悬垂石墨烯纳米带中观察到周期性导电振荡，这些振荡归因于形成于窄带部分的量子点，它们位于缺陷势能的谷和峰处。双门栅结构下观察到了双量子点系统的特征，电场约束在单层石墨烯中得以实现，暗示了一种通过Landau能级间隙创建可操控的量子点的方法，这对于利用量子霍尔边缘态进行研究具有潜在价值。

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摘要：

We report on the observation of periodic conductance oscillations near quantum Hall plateaus in suspended graphene nanoribbons. They are attributed to single quantum dots that are formed in the narrowest part of the ribbon, in the valleys and hills of a disorder potential. In a wide flake with two gates, a double-dot system's signature has been observed. Electrostatic confinement is enabled in single-layer graphene due to the gaps that are formed between the Landau levels, suggesting a way to create gate-defined quantum dots that can be accessed with quantum Hall edge states.

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