Identification of the compressive trigonal crystal field and orbital polarization in strained monolayer α-RuCl3 on graphite
Identification of the compressive trigonal crystal field and orbital polarization in strained monolayer α-RuCl3 on graphite
复制标题
石墨上应变单层 α-RuCl3 的压缩三角晶体场和轨道极化的识别
DOI：
10.1007/s44214-022-00016-8
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发表时间：
2022
期刊：
影响因子：
--
通讯作者：
Chunlei Gao
中科院分区：
文献类型：
--
作者：
Zhongjie Wang;Lu Liu;Meng;Haoran Zheng;Ke Yang;Chunzheng Wang;Fang Yang;Hua Wu;Chunlei Gao
由于 Jackeli-Khaliullin 机制的构象，α-RuCl3 是寻找具有领先的基塔耶夫项的量子自旋液态的一个诱人的场所。抑制非Kitaev相互作用以接近Kitaev极限是Kitaev-Jackeli-Khaliullin材料实验设计的主要目标，其实际可行性取决于对精确晶体结构的操纵。拉伸应变会导致进一步的压缩三角场分裂，从而改变自旋轨道纠缠特征并调整内在的跳跃交换，已被广泛提出作为增强比较基塔耶夫相互作用的有前途的策略。在这项工作中，我们对石墨基板上应变 α-RuCl3 单层的电子图案进行了深入的扫描隧道显微镜研究。基于陈的导数规则，通过分析各向异性尖端引起的横向梯度成像效应，识别出进一步的三角场分裂。由于应变的轻微不均匀性而导致的三角晶体场大小的空间变化与莫特间隙附近的轨道极化一致。所有证据都表明，拉伸的 α-RuCl3 单层中的压缩三角晶场提高了 t2g 态的简并性，具有更高的值 例如′\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$\text{e}_{\text{g}}'$\end{document} 和较低的 a1g 轨道，以及eg′\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} 的库仑相互作用\usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$\text{e}_{\text{g}}'$\end{document} 轨道对莫特效应负有主要责任。
α-RuCl3 is a tantalizing playground to search for the quantum spin liquid states with leading Kitaev term due to the conformation of Jackeli–Khaliullin mechanism. Suppressing the non-Kitaev interaction to approach the Kitaev limit is the major objective in the experimental design of Kitaev–Jackeli–Khaliullin materials, for which the practical feasibility rests on the manipulation of the exact crystalline structure. A tensile strain, leading to the further compressive trigonal field splitting which would alter the spin-orbital entangled character and tune the intrinsic hopping exchanges, has been widely proposed as the promising strategy to enhance the comparative Kitaev interaction. In this work, we preform in-depth Scan Tunneling Microscope study on the electronic patterns of strained α-RuCl3 monolayer on graphite substrate. Based on Chen’s derivative rule, a further trigonal field splitting is identified by analyzing the lateral-gradient imaging effect caused by an anisotropic tip. A spatial variation of the magnitude of trigonal crystal field due to the slight inhomogeneity of strain accords with the orbital polarization near the Mott gap. All evidences point to the facts that the compressive trigonal crystal field in the stretched α-RuCl3 monolayer lifts the degeneracy of t2g states with higher eg′\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$\text{e}_{\text{g}}'$\end{document} and lower a1g orbitals, and the Coulomb interactions of the eg′\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$\text{e}_{\text{g}}'$\end{document} orbitals take the main responsibility for the Mott effect.
影响因子：
4.6
作者：
Yadav R;Bogdanov NA;Katukuri VM;Nishimoto S;van den Brink J;Hozoi L
通讯作者：
Hozoi L