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Temperature-dependent resistivity in bilayer graphene due to flexural phonons

机译:弯曲声子在双层石墨烯中的温度依赖性电阻率

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摘要

We have studied electron scattering by out-of-plane (flexural) phonons in doped suspended bilayer graphene. We have found the bilayer membrane to follow the qualitative behavior of the monolayer cousin. In the bilayer, a different electronic structure combine with a different electron-phonon coupling to give the same parametric dependence in resistivity and, in particular, the same temperature (T) behavior. In parallel with the single layer, flexural phonons dominate the phonon contribution to resistivity in the absence of strain, where a density-independent mobility is obtained. This contribution is strongly suppressed by tension, and in-plane phonons become the dominant contribution in strained samples. Among the quantitative differences, an important one has been identified: room-temperature mobility in bilayer graphene is substantially higher than in monolayer graphene. The origin of quantitative differences has been unveiled.
机译:我们研究了掺杂悬浮双层石墨烯中平面外(弯曲)声子的电子散射。我们发现双层膜遵循单层表亲的定性行为。在双层中,不同的电子结构与不同的电子-声子耦合相结合,以提供相同的电阻率参数相关性,尤其是相同的温度(T)行为。与单层平行,在没有应变的情况下,挠曲声子在声子对电阻率的贡献中占主导地位,在该应变下获得了密度无关的迁移率。这种作用被张力强烈地抑制了,面内声子成为应变样品中的主要作用。在数量上的差异中,已经确定了一个重要的差异:双层石墨烯中的室温迁移率明显高于单层石墨烯中的室温迁移率。数量差异的起源已经揭晓。

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  • 来源
    《Physical review》 |2011年第23期|p.235416.1-235416.15|共15页
  • 作者单位

    Institute de Ciencia de Materiales de Madrid (CSIC), Sor Juana Ines de la Cruz 3, ES-28049 Madrid, Spain;

    Institute de Ciencia de Materiales de Madrid (CSIC), Sor Juana Ines de la Cruz 3, ES-28049 Madrid, Spain,Centro de Fisica do Porto, Rua do Campo Alegre 687, PT-4169-007 Porto, Portugal;

    Radboud University Nijmegen, Institute for Molecules and Materials, NL-6525 AJ Nijmegen, The Netherlands;

    Institute de Ciencia de Materiales de Madrid (CSIC), Sor Juana Ines de la Cruz 3, ES-28049 Madrid, Spain;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    scattering by phonons, magnons, and other nonlocalized excitations;

    机译:声子;磁振子和其他非局部激发的散射;

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