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Effects of a random gauge field on the conductivity of graphene sheets with disordered ripples

机译：随机应变场对无序波纹石墨烯片电导率的影响

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摘要

We study the effect of disordered ripples on the conductivity of monolayer graphene flakes. We calculate the relaxation times and the Boltzmann conductivities associated with two mechanisms. First, we study the conductivity correction due to an external in-plane magnetic field B_‖. Due to the irregular local curvature found in graphene sheets deposited over a substrate, B_‖ can be mapped into an effective random magnetic field perpendicular to the graphene surface. Second, we study the electron momentum relaxation due to intrinsic pseudomagnetic fields originated from deformations and strain. We find that the competition between these mechanisms gives rise to a strong anisotropy in the conductivity tensor. This result provides a new strategy to quantitatively infer the strength of pseudomagnetic fields in rippled graphene flakes.
机译：我们研究了无序波纹对单层石墨烯薄片电导率的影响。我们计算了弛豫时间和与两种机理相关的玻尔兹曼电导率。首先，我们研究了由于外部面内磁场B_''而引起的电导率校正。由于在沉积在基板上的石墨烯片中发现了不规则的局部曲率，因此可以将B_''映射到垂直于石墨烯表面的有效随机磁场中。其次，我们研究了由于变形和应变而产生的固有伪磁场引起的电子动量松弛。我们发现这些机制之间的竞争在电导率张量中引起了强烈的各向异性。该结果提供了一种新的策略，可以定量地推断波纹石墨烯薄片中伪磁场的强度。

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