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Heat transport in nonuniform superconductors

机译:非均匀超导体中的热传递

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摘要

We calculate electronic energy transport in inhomogeneous superconductors using a fully self-consistent nonequilibrium quasiclassical Keldysh approach. We develop a general theory and apply it to a superconductor with an order parameter that forms domain walls of the type encountered in the Fulde-Ferrell-Larkin-Ovchinnikov state. The heat transport in the presence of a domain wall is inherently anisotropic and nonlocal. The bound states in the nonuniform region play a crucial role and control heat transport in several ways: (ⅰ) they modify the spectrum of quasiparticle states and result in Andreev reflection processes and (ⅱ) they hybridize with the impurity band and produce a local transport environment with properties very different from those in a uniform superconductor. As a result of this interplay, heat transport becomes highly sensitive to temperature, magnetic field, and disorder. For strongly scattering impurities, we find that the transport across domain walls at low temperatures is considerably more efficient than in the uniform superconducting state.
机译:我们使用完全自洽的非平衡拟经典Keldysh方法计算非均质超导体中的电子能量传输。我们发展了一般理论,并将其应用于具有阶数参数的超导体,该阶数参数形成了在Fulde-Ferrell-Larkin-Ovchinnikov状态下遇到的类型的畴壁。在存在畴壁的情况下,热传递固有地是各向异性的并且是非局部的。非均匀区域中的束缚态起着至关重要的作用,并以多种方式控制热传递:(ⅰ)它们改变准粒子态的光谱并导致安德列夫反射过程;(ⅱ)它们与杂质带杂化并产生局部传递具有与均匀超导体完全不同的特性的环境。这种相互作用的结果是,热传递对温度,磁场和紊乱变得高度敏感。对于强烈散射的杂质,我们发现在低温下穿过畴壁的传输要比在均匀超导状态下有效得多。

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  • 来源
    《Physical review》 |2016年第6期|064502.1-064502.13|共13页
  • 作者单位

    Department of Physics, Montana State University, Bozeman, Montana 59717, USA;

    Department of Physics, Montana State University, Bozeman, Montana 59717, USA;

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