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Thermoelectric and thermal transport in bilayer graphene systems

机译:双层石墨烯系统中的热电和热传输

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摘要

We numerically study the disorder effect on the thermoelectric and thermal transport in bilayer graphene under a strong perpendicular magnetic field. In the unbiased case, we find that the thermoelectric transport has similar properties as in monolayer graphene, i.e., the Nernst signal has a peak at the central Landau level (LL) with a height of the order of kB/e and changes sign near other LLs, while the thermopower has an opposite behavior. We attribute this to the coexistence of particle and hole LLs around the Dirac point. When a finite interlayer bias is applied and a band gap is opened, it is found that the transport properties are consistent with those of a band insulator. We further study the thermal transport from electronic origin and verify the validity of the generalized Weidemann-Franz law.
机译:我们通过数值研究了在强垂直磁场下双层石墨烯对热电和热输运的无序影响。在无偏的情况下,我们发现热电输运具有与单层石墨烯相似的特性,即能斯特信号在中央朗道能级(LL)处具有一个峰值,其高度约为kB / e,并且在其他位置附近改变符号LL,而火电则相反。我们将其归因于狄拉克点周围的粒子和空穴LL并存。发现当施加有限的层间偏压并且打开带隙时,发现传输特性与带绝缘体的传输特性一致。我们进一步研究了电子起源的热传递,并验证了广义Weidemann-Franz定律的有效性。

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  • 来源
    《Physical review》 |2011年第7ptab期|p.075420.1-075420.8|共8页
  • 作者单位

    Faculty of Mathematics and Physics, Nanjing University of Information Science and Technology, Nanjing 210044, China,Department of Physics and Astronomy, California State University, Northridge, California 91330, USA;

    Theoretical Division and Center for Nonlinear Studies, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA;

    National Laboratory of Solid State Microstructures and Department of Physics, Nanjing University, Nanjing 210093, China;

    Department of Physics, Southeast University, Nanjing 210096, China;

    Department of Physics and Astronomy, California State University, Northridge, California 91330, USA;

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

    theory of electronic transport; scattering mechanisms; thermoelectric effects; theory and modeling;

    机译:电子运输理论;散射机理;热电效应;理论与模型;

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