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Piezoconductivity of gated suspended graphene

机译：门控悬浮石墨烯的压电性能

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摘要

We investigate the conductivity of graphene sheet deformed over a gate. The effect of the deformation on the conductivity is twofold: The lattice distortion can be represented as pseudovector potential in the Dirac equation formalism, whereas the gate causes inhomogeneous density redistribution. We use the elasticity theory to find the profile of the graphene sheet and then evaluate the conductivity by means of the transfer matrix approach. We find that the two effects provide functionally different contributions to the conductivity. For small deformations and not too high residual stress the correction due to the charge redistribution dominates and leads to the enhancement of the conductivity. For stronger deformations, the effect of the lattice distortion becomes more important and eventually leads to the suppression of the conductivity. We consider homogeneous as well as local deformation. We also suggest that the effect of the charge redistribution can be best measured in a setup containing two gates, one fixing the overall charge density and another one deforming graphene locally.
机译：我们研究了在栅极上变形的石墨烯片的电导率。变形对电导率的影响是双重的：晶格畸变可以表示为Dirac方程形式主义中的伪矢量电势，而门引起密度不均匀的重新分布。我们使用弹性理论来找到石墨烯片的轮廓，然后通过转移矩阵方法评估电导率。我们发现这两种效应在功能上对电导率的贡献不同。对于较小的变形和不太高的残余应力，由于电荷重新分布引起的校正占主导地位，并导致电导率的提高。对于更强的变形，晶格畸变的影响变得更加重要，并最终导致电导率的降低。我们考虑均匀变形和局部变形。我们还建议，在包含两个栅极的设置中，最好地测量电荷重新分布的效果，其中一个固定整体电荷密度，另一个固定石墨烯局部变形。

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