arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1801.06178cond-mat.str-elcond-mat.dis-nnhep-thquant-ph
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具有临界费米面的平移不变非费米液态金属:可解模型

Translationally invariant non-Fermi liquid metals with critical Fermi-surfaces: Solvable models

Debanjan Chowdhury, Yochai Werman, Erez Berg, T. Senthil

摘要:

我们构建了强相关金属的几何不变可解模型的例子,这些模型由具有相同局部相互作用的Sachdev-Ye-Kitaev点的晶格组成。这些模型显示交叉作为温度的函数,进入具有局部量子临界性和边缘费米液体行为的制度。在边缘费米液体制度,直流电阻率随温度在很宽的温度范围内线性增加。通过推广相互作用的形式,我们还构建了具有临界费米表面的非费米液体的例子。自能具有奇异的频率依赖性,但缺乏动量依赖性,这让人想起类似动力学平均场论的行为,但在维度上是$d<\infty$。在低温和强耦合极限下,形成重费米液体。在非费米液体制度的临界费米面引起的量子振荡的磁化强度作为一个功能的外部磁场在准粒子激发的情况下。我们讨论了这些结果的影响,局部量子临界性和基本的界限上的弛豫率。借鉴这些模型的经验教训,我们制定了粗粒度的描述一类中等规模的非费米液体行为的一般相关金属的示意图。

英文摘要:

We construct examples of translationally invariant solvable models of strongly-correlated metals, composed of lattices of Sachdev-Ye-Kitaev dots with identical local interactions. These models display crossovers as a function of temperature into regimes with local quantum criticality and marginal-Fermi liquid behavior. In the marginal Fermi liquid regime, the dc resistivity increases linearly with temperature over a broad range of temperatures. By generalizing the form of interactions, we also construct examples of non-Fermi liquids with critical Fermi-surfaces. The self energy has a singular frequency dependence, but lacks momentum dependence, reminiscent of a dynamical mean field theory-like behavior but in dimensions $d<\infty$. In the low temperature and strong-coupling limit, a heavy Fermi liquid is formed. The critical Fermi-surface in the non-Fermi liquid regime gives rise to quantum oscillations in the magnetization as a function of an external magnetic field in the absence of quasiparticle excitations. We discuss the implications of these results for local quantum criticality and for fundamental bounds on relaxation rates. Drawing on the lessons from these models, we formulate conjectures on coarse grained descriptions of a class of intermediate scale non-fermi liquid behavior in generic correlated metals.

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