Tilted potential induced coupling of localized states in a graphene nanoconstriction
Tilted potential induced coupling of localized states in a graphene nanoconstriction
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DOI：
10.1103/physrevb.83.115441
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发表时间：
2011-03-23
影响因子：
3.7
通讯作者：
Smith, C. G.
中科院分区：
文献类型：
--
作者：
Connolly, M. R.;Chiu, K. L.;Smith, C. G.
我们使用低温扫描探针显微镜的带电尖端来扰乱通过石墨烯纳米收缩的传输。电导图作为尖端位置的函数显示同心光晕，通过跟踪光晕随背栅电压的扩展，我们能够识别它们起源的纳米收缩上方的细长域。传输谐振的幅度调制与尖端感应电势的梯度相关，我们根据局域态之间修改的隧道耦合来分析这一点。
We use the charged tip of a low-temperature scanning probe microscope to perturb the transport through a graphene nanoconstriction. Maps of the conductance as a function of tip position display concentric halos and, by following the expansion of the halos with back-gate voltage, we are able to identify an elongated domain over the nanoconstriction where they originate. Amplitude modulations of the transmission resonances are correlated with the gradient of the tip-induced potential and we analyze this in terms of modified tunnel coupling between localized states.