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Effect of Stacking Order on the Electric-Field Induced Carrier Modulation in Graphene Bilayers

机译:堆叠顺序对石墨烯双层中电场诱导的载流子调制的影响

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摘要

When planar graphene sheets are stacked on top of each other, the electronic structure of the system varies with the position of the subsequent sublattice atoms. Here, we employ scanning photocurrent microscopy to study the disparity in the behavior of charge carriers for two different stacking configurations. It has been found that deviation from the regular Bernal stacking decouples the sheets from each other, which Imparts effective electrostatic screening of the farther layer from the underlying backgate. Electrochemical top-gating is demonstrated as a means to selectively tune the charge carrier density in the decoupled upper layer.
机译:当平面石墨烯片彼此堆叠时,系统的电子结构会随后续亚晶格原子的位置而变化。在这里,我们采用扫描光电流显微镜来研究两种不同堆叠结构的载流子行为的差异。已经发现,与常规的伯纳尔堆叠的偏离使薄片彼此解耦,这妨碍了从下面的背板有效地对更远的层进行静电屏蔽。电化学顶浇口被证明是一种在去耦的上层中选择性调节电荷载流子密度的方法。

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