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Large changes of graphene conductance as a function of lattice orientation between stacked layers

机译：石墨烯电导的大变化随堆叠层之间晶格取向的变化

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摘要

Using the conductive tip of an atomic force microscope as an electrode, we found that the electrical conductance of graphite terraces separated by steps can vary by large factors of up to 100, depending on the relative lattice orientation of the surface and subsurface layers. This effect can be attributed to interlayer interactions that, when stacked commensurately in a Bernal sequence (ABAB ... ), cause the band gap to open. Misaligned layers, on the other hand, behave like graphene. Angular misorientations of a few degrees were found to cause large increases in the conductance of the top layer, with the maximum occurring around 30 degrees. These results suggest new applications for graphene multilayers by stacking layers at various angles to control the resistance of the connected graphene ribbons in devices.
机译：使用原子力显微镜的导电尖端作为电极，我们发现，阶梯状分隔的石墨台阶的电导率可以变化高达100的大因数，具体取决于表面层和地下层的相对晶格取向。这种影响可归因于层间相互作用，当按伯纳尔序列（ABAB ...）相称堆叠时，会导致带隙打开。另一方面，未对齐的层的行为类似于石墨烯。发现几度的角度取向错误会导致顶层电导大大增加，最大值出现在30度左右。这些结果提出了通过以各种角度堆叠层以控制器件中连接的石墨烯带的电阻的石墨烯多层的新应用。

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