Emergence of non-Fermi liquid dynamics through nonlocal correlations in an interacting disordered system
Emergence of non-Fermi liquid dynamics through nonlocal correlations in an interacting disordered system
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DOI：
10.1103/physrevb.98.075112
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发表时间：
2017-08
影响因子：
3.7
通讯作者：
Sudeshna Sen;N. Vidhyadhiraja;M. Jarrell
中科院分区：
文献类型：
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作者：
Sudeshna Sen;N. Vidhyadhiraja;M. Jarrell
在Anderson-Hubbard电子与猝灭无序相互作用模型中，我们提供了与近藤屏蔽破坏相关的量子临界点(QCP)的有力证据。确定了一个独特的交叉能量标度，它区分了量子临界风扇金属侧的费米液体和非费米液体(NFL)散射动力学。在无序驱动的QCP中，标度消失。我们通过测量近藤尺度的分布来解释我们的结果，发现当这个分布获得有限的截距时，QCP发生，这表明了Kondo破坏的情景，尽管与当地的QCP图不同。NFL行为被证明源于强烈的电子-电子相互作用和由潜在的随机势引起的短程动力学涨落的系统包含。这些结果是通过基于典型的介质动力学团簇近似的计算框架得到的。
We provide strong evidence of a quantum critical point (QCP) associated with the destruction of Kondo screening in the Anderson-Hubbard model for interacting electrons with quenched disorder. A unique crossover energy scale, $\omega^*$ separating the Fermi liquid and non-Fermi liquid (nFL) scattering dynamics on the metallic side of the quantum critical fan is identified. The scale vanishes at the disorder driven QCP. We interpret our results by measuring the distribution of Kondo scales and find that the QCP occurs when this distribution acquires a finite intercept, indicating a Kondo destruction scenario, albeit distinct from the local QCP picture. The nFL behavior is shown to stem from an interplay of strong electron-electron interactions and the systematic inclusion of short-range dynamical fluctuations induced by the underlying random potential. The results have been obtained through a computational framework based on the typical medium dynamical cluster approximation.