Theory for Charge Density Wave and Orbital-Flux State in Antiferromagnetic Kagome Metal FeGe
Theory for Charge Density Wave and Orbital-Flux State in Antiferromagnetic Kagome Metal FeGe
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反铁磁Kagome金属FeGe中的电荷密度波和轨道通量态理论
DOI：
10.1088/0256-307x/41/4/047103
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发表时间：
2023
影响因子：
3.5
通讯作者：
Jianpeng Liu
中科院分区：
文献类型：
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作者：
Haiyang Ma;Jia;M Zahid Hasan;Jianpeng Liu
从理论上研究了一种新型反铁磁性金属铁锗的电荷序和轨道磁性。基于第一性原理密度泛函理论计算，研究了反铁磁kagome金属FeGe的电子结构、费米表面量子涨落和声子性质。研究发现，由于电子-电子相互作用和电子-声子耦合之间的微妙合作，在这种系统中出现电荷密度波，这导致了相互作用引发声子不稳定的不寻常情况，最终产生电荷密度波（CDW）状态。我们进一步表明，在CDW阶段，基态电流密度分布呈现出一个有趣的大卫之星模式，导致磁通密度调制。该系统中的轨道通量（或电流环）是磁性、晶格几何形状、电荷顺序和自旋轨道耦合（SOC）之间微妙相互作用的结果，可以用一个简单而通用的紧密结合理论来描述，其中包括kane - mele型SOC项和磁交换相互作用。我们进一步研究了FeGe中特殊阶边态的起源，揭示了这种新型kagome反铁磁材料的拓扑性质和相关效应。
We theoretically study the charge order and orbital magnetic properties of a new type of antiferromagnetic kagome metal FeGe. Based on first-principles density functional theory calculations, we study the electronic structures, Fermi-surface quantum fluctuations, as well as phonon properties of the antiferromagnetic kagome metal FeGe. It is found that charge density wave emerges in such a system due to a subtle cooperation between electron–electron interactions and electron–phonon couplings, which gives rise to an unusual scenario of interaction-triggered phonon instabilities, and eventually yields a charge density wave (CDW) state. We further show that, in the CDW phase, the ground-state current density distribution exhibits an intriguing star-of-David pattern, leading to flux density modulation. The orbital fluxes (or current loops) in this system emerge as a result of the subtle interplay between magnetism, lattice geometries, charge order, and spin-orbit coupling (SOC), which can be described by a simple, yet universal, tight-binding theory including a Kane–Mele-type SOC term and a magnetic exchange interaction. We further study the origin of the peculiar step-edge states in FeGe, which sheds light on the topological properties and correlation effects in this new type of kagome antiferromagnetic material.
DOI：
10.1136/ebmh.11.4.102
发表时间：
2008-10
期刊：
Evidence Based Mental Health
影响因子：
--
作者：
P. Cochat;L. Vaucoret;J. Sarles
通讯作者：
P. Cochat;L. Vaucoret;J. Sarles