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arXiv 0912.0769cond-mat.dis-nncond-mat.mes-hall
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无序石墨烯单层中的金属-绝缘转变

Metallic-to-insulating transition in disordered graphene monolayers

M. Hilke

摘要:

我们发现,当石墨烯单层是无序的,电导表现出金属到绝缘的转变,这打开了新的电子器件的大门。通过驱动密度或费米能通过迁移率边缘可以观察到跃迁。在狄拉克点,系统是局域化的,而在更高的密度下,在系统在更高的密度下再次变得绝缘之前,有一个金属行为的区域。金属行为的区域取决于无序强度,并最终在高度无序时消失。这个结果是非常出乎意料的,因为在正方形晶格中,标度理论预测这种金属区域不存在于二维中,与石墨烯相反,其中晶格是蜂窝状的。

英文摘要:

We show that when graphene monolayers are disordered, the conductance exhibits a metallic-to-insulating transition, which opens the door to new electronic devices. The transition can be observed by driving the density or Fermi energy through the mobility edge. At the Dirac point the system is localized, whereas at higher densities there is a region of metallic behavior before the system becomes insulating again at higher densities. The region of metallic behavior depends on the disorder strength and eventually vanishes at high disorder. This result is quite unexpected since in square lattices, scaling theory predicts that this metallic region does not exist in two dimensions, in contrast to graphene, where the lattice is a honeycomb.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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