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Weak Localization in Graphene: Theory Simulations and Experiments

机译:石墨烯中的弱本地化:理论模拟和实验

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摘要

We provide a comprehensive picture of magnetotransport in graphene monolayers in the limit of nonquantizing magnetic fields. We discuss the effects of two-carrier transport, weak localization, weak antilocalization, and strong localization for graphene devices of various mobilities, through theory, experiments, and numerical simulations. In particular, we observe a minimum in the weak localization and strong localization length reminiscent of the minimum in the conductivity, which allows us to make the connection between weak and strong localization. This provides a unified framework for both localizations, which explains the observed experimental features. We compare these results to numerical simulation and find a remarkable agreement between theory, experiment, and numerics. Various graphene devices were used in this study, including graphene on different substrates, such as glass and silicon, as well as low and high mobility devices.
机译:我们提供了在非量化磁场限制下在石墨烯单层中磁传输的全面描述。通过理论,实验和数值模拟,我们讨论了两种载流子传输,弱定位,弱反定位和强定位对各种迁移率的石墨烯器件的影响。特别是,我们观察到弱定位和强定位长度的最小值,使人联想到电导率的最小值,这使我们能够在弱定位和强定位之间建立联系。这为两个本地化提供了一个统一的框架,解释了观察到的实验特征。我们将这些结果与数值模拟进行比较,并在理论,实验和数值之间找到了显着的一致性。在这项研究中使用了各种石墨烯器件,包括在不同基板(例如玻璃和硅)上的石墨烯,以及低迁移率和高迁移率的器件。

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