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Absence of a metallic phase in charge-neutral graphene with a random gap

机译:电荷中性石墨烯中无随机间隙的金属相的缺乏

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摘要

It is known that fluctuations in the electrostatic potential allow for metallic conduction (nonzero conductivity in the limit of an infinite system) if the carriers form a single species of massless two-dimensional Dirac fermions. A nonzero uniform mass M opens up an excitation gap, localizing all states at the Dirac point of charge neutrality. Here we investigate numerically whether fluctuations δM M ≠0 in the mass can have a similar effect as potential fluctuations, allowing for metallic conduction at the Dirac point. Our negative conclusion confirms earlier expectations but does not support the recently predicted metallic phase in a random-gap model of graphene.
机译:众所周知,如果载流子形成单一种类的无质量二维狄拉克费米子,则静电势的波动会导致金属传导(在无限系统的极限内非零传导率)。非零的均匀质量M会打开一个激发间隙,使所有状态都局限在Dirac电荷中性点。在这里,我们通过数值研究质量中的波动δM M≠0是否可以起到与电位波动类似的作用,从而允许在狄拉克点处进行金属传导。我们的负面结论证实了较早的期望,但不支持石墨烯随机间隙模型中最近预测的金属相。

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  • 来源
    《Physical review》 |2010年第12期|p.121414.1-121414.3|共3页
  • 作者单位

    Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA Department of Physics, University of California, Berkeley, California 94720, USA Laboratory of Atomic and Solid State Physics, Cornell University, Ithaca, New York 14853, USA;

    rnInstituut-Lorentz, Universiteit Leiden, P.O. Box 9506, 2300 RA Leiden, The Netherlands;

    rnInstitute of Theoretical Physics, University of Warsaw, Hoza 69, 00-681 Warsaw, Poland;

    rnInstituut-Lorentz, Universiteit Leiden, P.O. Box 9506, 2300 RA Leiden, The Netherlands;

    rnInstituut-Lorentz, Universiteit Leiden, P.O. Box 9506, 2300 RA Leiden, The Netherlands;

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  • 正文语种 eng
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  • 关键词

    localization effects (anderson or weak localization); weak or anderson localization; delocalization processes;

    机译:本地化影响(安德森或弱本地化);弱或安德森本地化;离域过程;

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