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Thermal transport in graphene junctions and quantum dots

机译：石墨烯结和量子点中的热传输

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摘要

Thermal-transport properties of various graphene junctions and quantum dots with nanoscale width are systematically investigated by nonequilibrium Green's-function method. Thermal conductance is insensitive to the detailed structure of the contact region but substantially limited by the narrowest part of the systems. Thermal-contact resistance in nanodevices carved entirely from graphene is quite low (～10~(-10) m~2 K/W at 300 K), at least one order lower than that between graphene and other materials. Interestingly, thermal-contact resistance of double-interface junctions is just slightly higher than that of single-interface junctions, distinct from the case of electronic transport. Moreover, graphene junctions with smaller connection angles show lower thermal conductance but higher electronic conductance. The different, even opposite dependences of thermal-and electronic-transport properties on the structural characteristics may find wide applications in nanoelectron-ics and thermoelectricity.
机译：通过非平衡格林函数方法系统地研究了各种石墨烯结和具有纳米级宽度的量子点的热传输性质。导热对接触区域的详细结构不敏感，但基本上受系统最狭窄部分的限制。完全由石墨烯雕刻而成的纳米器件的热接触电阻非常低（在300 K时约为10〜（-10）m〜2 K / W），比石墨烯与其他材料之间的接触电阻低至少一个数量级。有趣的是，与电子传输的情况不同，双界面结的热接触电阻仅略高于单界面结的热接触电阻。此外，具有较小连接角的石墨烯结显示出较低的热导率但具有较高的电子电导率。热和电子传输特性对结构特性的不同甚至相反的依赖关系可能在纳米电子学和热电学中得到广泛的应用。

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  • 来源
    《Physical review》 |2010年第19期|P.195425.1-195425.7|共7页
  • 作者

    Yong Xu; Xiaobin Chen; Jian-Sheng Wang; Bing-Lin Gu; Wenhui Duan;

  • 作者单位

    Center for Advanced Study and Department of Physics, Tsinghua University, Beijing 100084, People's Republic of China;

    Center for Advanced Study and Department of Physics, Tsinghua University, Beijing 100084, People's Republic of China;

    Center for Computational Science and Engineering and Department of Physics, National University of Singapore, Singapore 117542, Republic of Singapore;

    Center for Advanced Study and Department of Physics, Tsinghua University, Beijing 100084, People's Republic of China;

    Center for Advanced Study and Department of Physics, Tsinghua University, Beijing 100084, People's Republic of China;

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  • 正文语种 eng
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  • 关键词

    heat conduction;

    机译：热传导;

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