准低维(准低维)无机材料不仅非常适合角分辨光电子能谱(ARPES),而且它们为研究新兴的非费米液体(non-FL)物理学范式的关键概念提供了丰富的基础。在这篇文章中,我们讨论了ARPES技术应用于三个准低D无机金属:一个典型的费米液体(FL)材料TiTe $_{2}$,一个著名的准一维电荷密度波(CDW)材料K $_{0.3}$ MoO $_{3}$和一个准一维非CDW材料Li $_{0.9}$ Mo $_{6}$ O $_{17}$。与TiTe $_2$,我们建立了多体理论解释的ARPES线的形状是可能的。我们还解决了如何从ARPES准确地确定{\bf k} $_F$值的基本问题。K $_{0.3}$ MoO $_{3}$和Li $_{0.9}$ Mo $_{6}$ O $_{17}$均表现出非FL线型的准一维电子结构。对于K $_{0.3}$ MoO $_{3}$观察到CDW能隙开口,而对于Li $_{0.9}$ Mo $_{6}$ O $_{17}$没有观察到能隙。然而,我们发现,标准的CDW理论,即使有很强的波动,是不足以描述的非FL线形状的K $_{0.3}$钼$_{3}$。我们认为,一个Luttinger液体(LL)模型是相关的青铜器,但也指出遇到的困难,在比较数据与理论。我们解释这种情况意味着一个更完整和现实的理论是必要的,以了解这些数据。
英文摘要:
Quasi-low-dimensional (quasi-low-D) inorganic materials are not only ideally suited for angle resolved photoemission spectroscopy (ARPES) but also they offer a rich ground for studying key concepts for the emerging paradigm of non-Fermi liquid (non-FL) physics. In this article, we discuss the ARPES technique applied to three quasi-low-D inorganic metals: a paradigm Fermi liquid (FL) material TiTe$_{2}$, a well-known quasi-1D charge density wave (CDW) material K$_{0.3}$MoO$_{3}$ and a quasi-1D non-CDW material Li$_{0.9}$Mo$_{6}$O$_{17}$. With TiTe$_2$, we establish that a many body theoretical interpretation of the ARPES line shape is possible. We also address the fundamental question of how to accurately determine the {\bf k}$_F$ value from ARPES. Both K$_{0.3}$MoO$_{3}$ and Li$_{0.9}$Mo$_{6}$O$_{17}$ show quasi-1D electronic structures with non-FL line shapes. A CDW gap opening is observed for K$_{0.3}$MoO$_{3}$, whereas no gap is observed for Li$_{0.9}$Mo$_{6}$O$_{17}$. We show, however, that the standard CDW theory, even with strong fluctuations, is not sufficient to describe the non-FL line shapes of K$_{0.3}$MoO$_{3}$. We argue that a Luttinger liquid (LL) model is relevant for both bronzes, but also point out difficulties encountered in comparing data with theory. We interpret this situation to mean that a more complete and realistic theory is necessary to understand these data.
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)
Three-Dimensional Fermiology by Soft-X-Ray ARPES: Origin of Charge Density Waves in VSe2
晶体材料的电子结构是其基本特征,几乎所有物理化学性质都是以电子结构为基础的。角分辨光电子能谱(ARPES)是研究所有电子结构的主要实验工具,具有k空间分辨率。然而,它的应用到三维(3D)材料遭受一个基本的问题,不明确的表面垂直波矢量kz。在这里,我们实现了清晰的定义kz,使精确的导航在3D k空间,通过推动ARPES到软X射线光子能量范围。突破光激发截面小这一臭名昭著的问题的关键是我们仪器的先进光子通量性能。我们探讨的过渡金属dichalcogenide VSe 2的电子结构,开发具有异国情调的3D字符的电荷密度波(CDWS)。我们实验确定嵌套的三维费米面(FS)作为这些CDW的前体。我们的研究表明,软X射线ARPES(SX-ARPES)解决三维电子结构的各个方面的巨大潜力。