Random-gap model for graphene and graphene bilayers.
Random-gap model for graphene and graphene bilayers.
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DOI：
10.1103/physrevlett.102.126802
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发表时间：
2008-11
影响因子：
8.6
通讯作者：
K. Ziegler
中科院分区：
文献类型：
--
作者：
K. Ziegler
在单层和双层石墨烯中研究了由随机交错电势产生的随机波动间隙的影响。计算中性点处的态密度、单粒子散射率和传输特性（扩散系数和电导率）。所有这些量在平均交错电势的临界值处消失，标志着向绝缘行为的连续转变。传输量与单粒子散射率直接相关。尽管单分子层和双层的行为在性质上是相同的，但后者的无序效应要强得多。
The effect of a randomly fluctuating gap, created by a random staggered potential, is studied in a monolayer and a bilayer of graphene. The density of states, the one-particle scattering rate, and the transport properties (diffusion coefficient and conductivity) are calculated at the neutrality point. All of these quantities vanish at a critical value of the average staggered potential, signaling a continuous transition to an insulating behavior. Transport quantities are directly linked to the one-particle scattering rate. Although the behavior is qualitatively the same in mono- and bilayers, the effect of disorder is much stronger in the latter.