Critical charge fluctuations and ω / T scaling at the Kondo break-down of Heavy Fermion systems
Critical charge fluctuations and ω / T scaling at the Kondo break-down of Heavy Fermion systems
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发表时间：
2018
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通讯作者：
Y. Komijani;P. Coleman
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作者：
Y. Komijani;P. Coleman
强相关电子系统的挑战之一是了解在反铁磁量子临界点（QCP）处发展的异常电子行为，这种现象已在重费米子材料中得到广泛研究。当前的理论主要集中在临界自旋波动和近藤效应的相关分解上。在这里，我们认为，伴随重费米子临界性的费米表面体积的突然变化会导致临界电荷波动。使用一维近藤晶格模型，其中每个时刻都连接到一个单独的传导浴，我们展示了通过具有 ω/T 比例的 QCP 在重费米液体和带隙自旋液体之间发生近藤击穿转变，其特征是与近藤单线态的破裂直接相关的临界电荷模式。我们讨论了这种紧急充电模式对实验的可能影响。
One of the challenges in strongly correlated electron systems, is to understand the anomalous electronic behavior that develops at an antiferromagnetic quantum critical point (QCP), a phenomenon that has been extensively studied in heavy fermion materials. Current theories have focused on the critical spin fluctuations and associated break-down of the Kondo effect. Here we argue that the abrupt change in Fermi surface volume that accompanies heavy fermion criticality leads to critical charge fluctuations. Using a model one dimensional Kondo lattice in which each moment is connected to a separate conduction bath, we show a Kondo breakdown transition develops between a heavy Fermi liquid and a gapped spin liquid via a QCP with ω/T scaling, which features a critical charge mode directly associated with the break-up of Kondo singlets. We discuss the possible implications of this emergent charge mode for experiment.