隐费米液体、散射率饱和和能斯特效应：DMFT观点
Hidden Fermi Liquid, Scattering Rate Saturation and Nernst Effect: a DMFT Perspective
摘要：
本文用动力学平均场论研究了关联金属的输运性质。只有在极低的温度范围$T_{FL}$之下才出现正则费米液体行为。令人惊讶的准粒子散射率遵循二次温度依赖性高得多的温度和跨越到饱和的行为周围的温度范围$T_{sat}$。我们确定这些准粒子的成分隐藏的费米液体。以上$T_{FL}$的非费米液体传输，特别是线性的$T$电阻率，被证明是一个强烈的温度依赖性带色散的结果。我们推导了电阻率、霍耳角、热电势和能斯特系数的简单表达式，并给出了与温度有关的重整化能带结构和准粒子散射率。我们讨论了可能的测试的DMFT图片运输使用交流测量。
英文摘要：
We investigate the transport properties of a correlated metal within dynamical mean field theory. Canonical Fermi liquid behavior emerges only below a very low temperature scale $T_{FL}$. Surprisingly the quasiparticle scattering rate follows a quadratic temperature dependence up to much higher temperatures and crosses over to saturated behavior around a temperature scale $T_{sat}$. We identify these quasiparticles as constituents of the hidden Fermi liquid. The non-Fermi liquid transport above $T_{FL}$, in particular the linear-in-$T$ resistivity, is shown to be a result of a strongly temperature dependent band dispersion. We derive simple expressions for resistivity, Hall angle, thermoelectric power and Nernst coefficient in terms of a temperature dependent renormalized band structure and the quasiparticle scattering rate. We discuss possible tests of the DMFT picture of transport using ac measurements.
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