Department of Physics and Astronomy, Rutgers University, 136 Frelinghuysen Road, New Jersey 08854, USA.
Phys Rev Lett. 2013 Jul 19;111(3):036401. doi: 10.1103/PhysRevLett.111.036401. Epub 2013 Jul 17.
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 the 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 dynamical mean-field theory picture of transport using ac measurements.
我们在动态平均场理论中研究了关联金属的输运性质。只有在非常低的温度标度 T(FL)以下，才会出现正则费米液体行为。令人惊讶的是，准粒子散射率在更高的温度范围内遵循二次温度依赖性，并在温度标度 T(sat)附近交叉到饱和行为。我们将这些准粒子识别为隐藏费米液体的组成部分。在 T(FL)以上的非费米液体输运，特别是线性 T 的电阻率，是由于强烈依赖温度的能带色散造成的。我们根据温度相关的重整化能带结构和准粒子散射率，推导出电阻率、霍尔角、热电功率和奈耳斯特系数的简单表达式。我们讨论了使用交流测量对输运的动态平均场理论图像进行可能的测试。
