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Charge fluctuations in nonlinear heat transport

机译:非线性热传输中的电荷波动

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摘要

We show that charge fluctuation processes are crucial for the nonlinear heat conductance through an interacting nanostructure, even far from a resonance. We illustrate this for an Anderson quantum dot accounting for the first two leading orders of the tunneling in a master equation. The often made assumption that off-resonant transport proceeds entirely by virtual occupation of charge states, underlying exchange-scattering models, can fail dramatically for heat transport. The identified energy-transport resonances in the Coulomb blockade regime provide qualitative information about relaxation processes, for instance, by a strong negative differential heat conductance relative to the heat current. These can go unnoticed in the charge current, making nonlinear heat-transport spectroscopy with energy-level control a promising experimental tool.
机译:我们表明,电荷起伏过程对于通过相互作用的纳米结构(甚至远离共振)的非线性热传导至关重要。我们用一个安德森量子点说明了这一点,该量子点说明了主方程中隧穿的前两个前导阶数。通常做出这样的假设:非谐振传输完全是通过电荷状态的虚拟占领,潜在的交换散射模型来进行的,因此对于热传输可能会严重失败。在库仑阻塞状态中确定的能量传输共振提供了有关弛豫过程的定性信息,例如,通过相对于热流的强负差分导热。这些在充电电流中可能不会被注意到,使得具有能级控制的非线性热传递光谱学成为有前途的实验工具。

著录项

  • 来源
    《Physical review》 |2015年第20期|201107.1-201107.5|共5页
  • 作者单位

    Institute for Theoretical Physics, Center for Extreme Matter and Emergent Phenomena, Utrecht University, Leuvenlaan 4, 3584 CE Utrecht, The Netherlands;

    Institute for Theoretical Physics, Center for Extreme Matter and Emergent Phenomena, Utrecht University, Leuvenlaan 4, 3584 CE Utrecht, The Netherlands;

    Peter Gruenberg Institut, Forschungszentrum Juelich, 52425 Juelich, Germany,Institute for Theory of Statistical Physics, RWTH Aachen University, 52056 Aachen, Germany,JARA-Fundamentals of Future Information Technology, Germany;

    Institute for Theoretical Physics, Center for Extreme Matter and Emergent Phenomena, Utrecht University, Leuvenlaan 4, 3584 CE Utrecht, The Netherlands;

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

    coulomb blockade; single-electron tunneling; thermoelectric effects; electronic transport in nanoscale materials and structures;

    机译:库仑封锁;单电子隧穿热电效应纳米级材料和结构中的电子传输;

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