Recently, angle-resolved photoemission spectroscopy has been used to highlight an anomalously large band renormalization at high binding energies in cuprate superconductors: the high energy "waterfall" or high energy anomaly (HEA). The anomaly is present for both hole- and electron-doped cuprates as well as the half-filled parent insulators with different energy scales arising on either side of the phase diagram. While photoemission matrix elements clearly play a role in changing the aesthetic appearance of the band dispersion, i.e. creating a "waterfall"-like appearance, they provide an inadequate description for the physics that underlies the strong band renormalization giving rise to the HEA. Model calculations of the single-band Hubbard Hamiltonian showcase the role played by correlations in the formation of the HEA and uncover significant differences in the HEA energy scale for hole- and electron-doped cuprates. In addition, this approach properly captures the transfer of spectral weight accompanying doping in a correlated material and provides a unifying description of the HEA across both sides of the cuprate phase diagram. We find that the anomaly demarcates a transition, or cross-over, from a quasiparticle band at low binding energies near the Fermi level to valence bands at higher binding energy, assumed to be of strong oxygen character.
The pursuit of a comprehensive understanding of the dynamical nature of intertwined orders in quantum matter has fueled the development of several new experimental techniques, including time- and angle-resolved photoemission spectroscopy (TR-ARPES). In this regard, the study of copper-oxide high-temperature superconductors, prototypical quantum materials, has furthered both the technical advancement of the experimental technique, as well as the understanding of their correlated dynamical properties. Here, we provide a brief historical overview of the TR-ARPES investigations of cuprates, and re…
Extremely Correlated Fermi Liquid Description of Normal State ARPES in Cuprates
用角分辨光电子能谱学（ARPES）测量的高温超导铜氧化物正常态单粒子谱函数，被认为是反常的，也是理解的关键。在这里，我们表明，一个前所未有的详细描述的数据所产生的光谱函数的极其相关的费米液态的t-J模型最近提出的Shastry。本说明书包括关于最佳掺杂的Bi $_2$ Sr $_2$ CaCu $_2$ O $_{8+δ}$的激光和常规同步加速器ARPES数据，以及关于La $_{1.85}$ Sr $_{0.15}$ CuO $_4$材料的常规同步加速器ARPES数据。{ \em它适用于具有相同物理参数值的所有数据集}，满足粒子求和规则，并成功解决了色散中两个广泛讨论的“扭结”异常。
Influence of the Third Dimension of Quasi-Two-Dimensional Cuprate Superconductors on Angle-Resolved Photoemission Spectra
角分辨光电子能谱（ARPES）在分析严格的二维（2D）材料时表现出显着的简化，但即使是最各向异性的物理系统也显示出一些残余的三维性。在这里，我们演示了如何第三个维度体现在准二维材料的ARPES光谱考虑的例子，铜酸盐铋$_2$锶$_2$钙铜$_2$ O $_{8}$（Bi 2212）。胞间，层间跳跃，这是负责$k_z$色散的频带，被发现诱导一个不可约的扩大的ARPES线的形状与特征依赖于面内动量$k_\parallel$。我们的研究表明，ARPES线型可以提供一个直接的光谱窗口，通过检测这种新的增宽机制，建立在材料中的相干c轴电导率的存在，并承担通过ARPES实验在新材料中的2D到3D交叉和赝能隙和条纹物理的理解。
Anomalous doping evolution of nodal dispersion revealed by in-situ ARPES on continuously doped cuprates
利用原位角分辨光电子能谱研究了高温超导体Bi $_2$ Sr $_2$ CaCu $_2$ O $_{8+x}$连续掺杂表面结色散的系统掺杂演化.我们发现，节点色散有三个部分分开的两个扭结，位于~10 meV和大约70 meV，分别。这三个段具有不同的带速和不同的掺杂依赖性。特别是，高能量段的速度随着掺杂水平的降低而单调增加，甚至可以超过裸带速度。我们建议，电子分馏是一个可能的原因，这种异常的节点色散，甚至可能发挥关键作用，在理解的奇特性质的铜酸盐。
Unified description of cuprate superconductors by fractionalized electrons emerging from integrated analyses of photoemission spectra and quasiparticle interference
Sophia University（上智大学）；RIKEN Center for Emergent Matter Science（理化学研究所物质结构科学中心）；National Institute for Materials Science（国立材料研究所）；RIKEN Center for Computational Science（理化学研究所计算科学中心）；Schrödinger Inc.（薛定谔公司）；University of Tokyo（东京大学）；Ames National Laboratory（艾姆斯国家实验室）；Iowa State University（爱荷华州立大学）；ISSP, University of Tokyo（东京大学国际超导材料研究中心）；Kyoto University（京都大学）
Temperature dependence of the angle resolved photoemission spectra in the undoped cuprates: self-consistent approach to the t-J-Holstein model
我们开发了一种新的自洽方法来研究角分辨光电子能谱（ARPES）的一个洞的t-J-Holstein模型给出完美的协议与数字精确的Diagrammatic Monte Carlo数据在零温度下的所有制度的电子-声子耦合。推广到有限温度的方法，我们发现，在未掺杂的铜酸盐的ARPES的异常温度依赖性的解释合作的相互作用的耦合的孔的磁波动和强的电子-声子相互作用。
Hybridization of Bogoliubov-quasiparticles between adjacent CuO$_2$ layers in the triple-layer cuprate Bi$_2$Sr$_2$Ca$_2$Cu$_3$O$_{10+δ}$ studied by ARPES
Occurrence of Fermi Pockets without Pseudogap Hypothesis and Clarification of the Energy Distribution Curves of Angle-Resolved Photoemission Spectroscopy in Underdoped Cuprate Superconductors
Buried double CuO chains in YBa$_2$Cu$_4$O$_8$ uncovered by nano-ARPES
在CuO链中的电子动力学一直难以捉摸的Y-Ba-Cu-O铜酸盐系统通过标准角分辨光电子能谱（ARPES），裂解样品表现出的领域终止于CuO链或BaO层，和一个典型的光束的大小结果ARPES信号，从两个终端叠加。在这里，我们采用空间分辨的ARPES与亚微米束（nano-ARPES），揭示了在YBa $_2$ Cu $_4$ O $_8$双CuO链的表面终止依赖的电子结构。我们提出了第一次观察到尖锐的金属色散和费米面的双CuO链埋在下面的CuO $_2$ -平面块上的BaO终止表面。虽然所观察到的费米面的CuO链是高度一维的，在CuO链中的电子不进行显着的电子相关性和没有签名的Tomonaga-Luttinger液体也不是边际费米液体被found. We的工作代表了一个重要的实验步骤，了解的电荷动力学，并提供了一个起始基础，为高$T_c$超导YBCO铜酸盐系统的建模。
广泛的ARPES和低能量非弹性中子散射研究铜氧化物超导体可以成功地描述使用弱耦合理论，其中准粒子在正方形晶格上通过标量和自旋相关的有效相互作用。在本文中，我们指出在Bi $_2$ Sr $_2$ Ca $_{1-x}$ Y $_x$ Cu $_2$ O $_8$（Bi 2212）中，两种探针都与主要的近邻海森堡相互作用相一致。我们讨论了高$T_c$超导机制的这一发现的影响。
Field induced antiferromagnetism and $^{17}$O Knight shift anomaly in La$_2$CuO$_4$
研究了铜酸盐弱铁磁体La $_2$ CuO $_4$顺磁态的场感生反铁磁效应。平面氧的$^{17}$ O Knight位移被证明是一个有效的工具来检查在外部磁场中的铜酸盐的Dzyaloshinsky-Moriya耦合的影响。场致反铁磁性和各向异性反铁磁性对$^{17}$ K的贡献解释了La $_2$ CuO $_4$中$^{17}$ O NMR中观察到的异常。反铁磁对$^{17}$ O Knight位移贡献的实验观察，可能是解决铜酸盐中Dzyaloshinsky矢量意义问题的唯一途径。
High-temperature superconducting cuprates exhibit an intriguing phenomenology for the low-energy elementary excitations. In particular, an unconventional temperature dependence of the coherent spectral weight (CSW) has been observed in the superconducting phase by angle-resolved photoemission spectroscopy (ARPES), both at the antinode where the d-wave paring gap is maximum, as well as along the gapless nodal direction. Here, we combine equilibrium and time-resolved ARPES to track the temperature dependent meltdown of the nodal CSW in Bi-based cuprates with unprecedented sensitivity. We find th…
Discrepancies in the low-energy quasiparticle dispersion extracted from angle resolved photoemission, scanning tunneling spectroscopy and quantum oscillation data are common and have long haunted the field of quantum matter physics. Here, we directly test the consistency of results from these three techniques by comparing data from the correlated metal Sr$_2$RhO$_4$. Using established schemes for the interpretation of the experimental data, we find good agreement for the Fermi surface topography and carrier effective masses. Hence, the apparent absence of such an agreement in other quantum mat…
Angle-resolved photoemission spectroscopy (ARPES) measurements have established the phenomenon of kink in band dispersion of high-$T_{\rm c}$ cuprate superconductors. However, systematic studies of the kink in electron-doped cuprates are still lacking experimentally. We performed $in$-$situ$ ARPES measurements on ${\rm La}_{2-x}{\rm Ce}_x{\rm CuO}_{4\pmδ}$ (LCCO) thin films over a wide electron doping ($n$) range from 0.05 to 0.23. While the nodal kink is nearly invisible, an antinodal kink around 45 meV, surviving above 200 K, is observed for $n\sim0.05-0.19$, whose position is roughly indepe…
