Dynamical charge density waves rule the phase diagram of cuprates
Dynamical charge density waves rule the phase diagram of cuprates
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DOI：
10.1103/physrevb.95.224511
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发表时间：
2017-06-14
影响因子：
3.7
通讯作者：
Grilli, M.
中科院分区：
文献类型：
--
作者：
Caprara, S.;Di Castro, C.;Grilli, M.
近年来，电荷密度波（cdw）在高温超导铜酸盐中被广泛地观察到，是目前在这些体系的争论中被研究最多的。大量新的实验数据提出了几个挑战各种理论建议的基本问题。我们在这里将强相关费米液体的平均场不稳定性线T-0（CDW）与伪间隙T*(p)线联系起来，以这种方式标记CDW波动的开始。这些波动大大降低了平均场的临界线。通过与探针的特征时间相关的红外频率截止来控制这种减少，我们考虑到复杂的实验温度与掺杂相图。我们提供了一个连贯的场景来解释为什么不同的实验探针观察到不同的CDW起始曲线，并且似乎在零温度下外推到中间和过掺杂区域中看似不同的量子临界点（QCPs）。由这些波动介导的几乎奇异的各向异性散射也解释了实验中霍尔数的快速变化，并为在低掺杂条件下完全建立费米表面重建提供了必要的第一步。最后，我们证明了CDWs的相位波动，在Mott绝缘相附近存在强相关性时增强，自然地解释了实验中看到的低掺杂另一个QCP时CDWs消失的原因。
In the last few years, charge density waves (CDWs) have been ubiquitously observed in high-temperature superconducting cuprates and are now the most investigated among the competing orders in the still hot debate on these systems. A wealth of new experimental data raises several fundamental issues that challenge the various theoretical proposals. We here relate our mean-field instability line T-0(CDW) of a strongly correlated Fermi liquid to the pseudogap T*(p) line, marking in this way the onset of CDW-fluctuations. These fluctuations reduce strongly the mean-field critical line. Controlling this reduction via an infrared frequency cutoff related to the characteristic time of the probes, we account for the complex experimental temperature versus doping phase diagram. We provide a coherent scenario explaining why different CDW onset curves are observed by different experimental probes and seem to extrapolate at zero temperature into seemingly different quantum critical points (QCPs) in the intermediate and overdoped region. The nearly singular anisotropic scattering mediated by these fluctuations also accounts for the rapid changes of the Hall number seen in experiments and provides the first necessary step for a possible Fermi surface reconstruction fully establishing at lower doping. Finally, we show that phase fluctuations of the CDWs, which are enhanced in the presence of strong correlations near the Mott insulating phase, naturally account for the disappearance of the CDWs at low doping with yet another QCP as seen by the experiments.