利用同步辐射角分辨光电子能谱首次研究了巡游超磁体Sr $_{4}$ Ru $_{3}$ O $_{10}$的低能电子结构，包括费米面拓扑.定义良好的准粒子带色散与矩阵元素依赖于光子能量或光子偏振。解决了四个带穿过费米能级，产生四个费米面片，并确定其完整的地形，有效质量以及它们的电子和空穴的性质。这些数据揭示了在近费米能级带色散的扭结结构的存在下，与能量范围从30毫电子伏到69毫电子伏。与以前报道的拉曼光谱和晶格动力学计算的研究，数据表明，这些扭结起源于强的电子-声子耦合存在于Sr $_{4}$ Ru $_{3}$ O $_{10}$。考虑到Sr $_{4}$ Ru $_{3}$ O $_{10}$的扭结结构与Ruddlesden Popper结构双烯酸盐的其他三个成员的扭结结构相似，提出了Sr $_{n+1}$ Ru $_{n}$ O $_{3n+1}$化合物中电子与氧相关声子强耦合的可能普遍性.
英文摘要：
The low-energy electronic structure, including the Fermi surface topology, of the itinerant metamagnet Sr$_{4}$Ru$_{3}$O$_{10}$ is investigated for the first time by synchrotron-based angle-resolved photoemission. Well-defined quasiparticle band dispersions with matrix element dependencies on photon energy or photon polarization are presented. Four bands crossing the Fermi-level, giving rise to four Fermi surface sheets are resolved; and their complete topography, effective mass as well as their electron and hole character are determined. These data reveal the presence of kink structures in the near-Fermi-level band dispersion, with energies ranging from 30 meV to 69 meV. Together with previously reported Raman spectroscopy and lattice dynamic calculation studies, the data suggest that these kinks originate from strong electron-phonon coupling present in Sr$_{4}$Ru$_{3}$O$_{10}$. Considering that the kink structures of Sr$_{4}$Ru$_{3}$O$_{10}$ are similar to those of the other three members of the Ruddlesden Popper structured ruthenates, the possible universality of strong coupling of electrons to oxygen-related phonons in Sr$_{n+1}$Ru$_{n}$O$_{3n+1}$ compounds is proposed.
Revealing the Electronic Structure of van der Waals Antiferromagnetic NiPS$_3$ through Synchrotron-Based $μ$-ARPES and Alkali Metal Dosing
Boston University（波士顿大学）；Lawrence Berkeley National Laboratory（劳伦斯伯克利国家实验室）；Rice University（莱斯大学）；Universidade Federal de Ouro Preto（欧罗普雷托联邦大学）；Universidade Federal de Minas Gerais（米纳斯吉拉斯联邦大学）；University of Bristol（布里斯托大学）
Strength of the phonon-coupling mode in $La_{2-x}Sr_{x}CuO_{4}$, $Bi_{2}Sr_{2}CaCu_{2}O_{8+x}$ and $YBa_{2}Cu_{3}O_{6+x}$: An estimation from the ARPES-nodal measurements
本文采用{ \it ab initio}多体GW方法计算了自支撑未掺杂石墨烯的自能、准粒子能带图和光谱函数。相对于其他方法，我们在数值上考虑了真实石墨烯的完整离子和电子结构，并从第一原理引入了电子-电子相互作用和相关效应。非厄米和动力学组件的自能被充分考虑。相对于DFT-LDA，费米速度大大重整化，并提高了17%，与磁输运实验更好地吻合。此外，接近狄拉克点的线性色散被修改的扭结的存在下，在ARPES实验中观察到的。我们的计算表明，扭结是由于低能量的$π\to π^*$单粒子激发和$π$等离子体激元。最后，GW自能不打开带隙。
Weak Electron-Phonon Coupling and Unusual Electron Scattering of Topological Surface States in Sb(111) by Laser-Based Angle-Resolved Photoemission Spectroscopy
Doping Evolution of Nodal Electron Dynamics in Trilayer Cuprate Superconductor Bi$_2$Sr$_2$Ca$_2$Cu$_3$O$_{10+δ}$ Revealed by Laser-Based Angle-Resolved Photoemission Spectroscopy
Detailed Electronic Structure of the Three-Dimensional Fermi Surface and its Sensitivity to Charge Density Wave Transition in ZrTe3 Revealed by High Resolution Laser-Based Angle-Resolved Photoemission Spectroscopy
