Electronic flat bands can lead to rich many-body quantum phases by quenching the electron's kinetic energy and enhancing many-body correlation. The reduced bandwidth can be realized by either destructive quantum interference in frustrated lattices, or by generating heavy band folding with avoided band crossing in Moire superlattices. Here we propose a general approach to introduce flat bands into widely studied transition metal dichalcogenide (TMD) materials by dilute intercalation. A flat band with vanishing dispersion is observed by angle-resolved photoemission spectroscopy (ARPES) over the entire momentum space in intercalated Mn1/4TaS2. Polarization dependent ARPES measurements combined with symmetry analysis reveals the orbital characters of the flat band. Supercell tight-binding simulations suggest that such flat bands arising from destructive interference between Mn and Ta on S through hopping pathways, are ubiquitous in a range of TMD families as well as for different intercalation configurations. Our findings establish a new material platform to manipulate flat band structures and explore their corresponding emergent correlated properties.
Structural and Magnetic Characterization of Large Area, Free-Standing Thin Films of Magnetic Ion Intercalated Dichalcogenides Mn0.25TaS2 and Fe0.25TaS2
Symmetry-guided and AI-accelerated design of intercalated transition metal dichalcogenides for antiferromagnetic spintronics
Shenzhen Geim Graphene Center & Shenzhen Key Laboratory of Advanced Layered Materials for Value-added Applications, Institute of Materials Research, Tsinghua Shenzhen International Graduate School, Tsinghua University（清华大学深圳国际研究生院材料研究所）；School of Science, State Key Laboratory on Tunable Laser Technology and Ministry of Industry and Information Technology Key Lab of Micro-Nano Optoelectronic Information System, Harbin Institute of Technology, Shenzhen（哈尔滨工业大学（深圳）理学院）；State Key Laboratory of Low Dimensional Quantum Physics and Department of Physics, Tsinghua University（清华大学物理系）；Institute for Advanced Study, Tsinghua University（清华大学高等研究院）；Frontier Science Center for Quantum Information（量子信息前沿科学中心）
Altermagnetism, Kagome Flat Band, and Weyl Fermion States in Magnetically Intercalated Transition Metal Dichalcogenides
University of Missouri（密苏里大学）；National Cheng Kung University（国立成功大学）；Center for Quantum Frontiers of Research and Technology (QFort)（量子前沿研究与技术中心）；National Center for Theoretical Sciences（国家理论科学中心）
Multiferroic materials based on transition-metal dichalcogenides: Potential platform for reversible control of Dzyaloshinskii-Moriya interaction and skyrmion via electric field
Commensurate stacking phase transitions in an intercalated transition metal dichalcogenide
插层和堆垛阶数调制是控制过渡金属二硫属化物（TMDCs）层间相互作用的两种有效方法，它们可以产生多种新相，并可用于工程材料。本文报道了Pb插层TMDCs--Pb（Ta $_{1+x}$ Se $_2$）$_2$（第一个124相）的生长。Pb（Ta $_{1+x}$ Se $_2$）$_2$在230 K附近表现出独特的两步一级结构相变。转变仅与堆叠自由度相关，从具有ABC堆叠和对称性$R3m$的高温相发展到具有AB堆叠和$P3m1$的中间相，最后发展到再次具有对称性$R3m$但具有ACB堆叠的低温相。每一步都涉及到一个由向量[1/3，2/3，0]组成的积木块的刚性滑动。有趣的是，巨大的晶格收缩发生在变暖的转变。在低温下，观察到$T_\textrm{c}\approx$ 1.8 K的体超导电性。结构相变的基本物理从第一性原理计算进行了讨论。对称性分析揭示了能带结构中的拓扑节线。我们的研究结果表明，实现更高阶的金属插层相的TMDC的可能性，推进我们的多晶型转变的知识，并可能激发在TMDC和超越堆叠顺序工程。
Tunability of the magnetic properties in Ni intercalated transition metal dichalcogenide NbSe$_2$
International Research Centre Magtop, Institute of Physics, Polish Academy of Sciences（波兰科学院物理研究所磁学国际研究中心）；Institute of Physics, Polish Academy of Sciences（波兰科学院物理研究所）
Magnetic Frustration Enforced Electronic Reconstruction in Ni intercalated NbSe$_{2}$: Suppression of Electronic Orders
International Research Centre MagTop, Institute of Physics, Polish Academy of Sciences（波兰科学院物理研究所马格托普国际研究中心）；Institute of Physics, Polish Academy of Sciences（波兰科学院物理研究所）；Peter Grünberg Institut (PGI-6), Forschungszentrum Jülich GmbH（于利希研究中心彼得·格林贝格研究所（PGI-6））；RWTH Aachen University（亚琛工业大学）
Magnetic ground states of a model for (TM)Nb$_3$S$_6$, TM=Co, Fe, Ni
过渡金属插层的二硫属化物CoNb $_3$ S $_6$是一种三角形反铁磁体，最近被证明在低于Néel温度下表现出大的反常霍尔效应（AHE），即使对外场的响应非常小。这表明，有一个有趣的磁性结构，与电子结构相互作用，产生AHE，因为共线反铁磁体不能表现出非零的AHE。我们提出了一个磁性过渡金属插层二硫属化合物的模型，并研究了它的基态作为相互作用参数的函数。该模型表现出平面自旋螺旋，非平面自旋螺旋，和一个特定的非共面所谓的$3q$状态之间的过渡。后一种状态必须表现出非零的AHE，而自旋螺旋则没有。
Dzyaloshinskii-Moriya interactions and magnetic texture in the Fe films deposited on transition-metal dichalcogenides
采用第一性原理密度泛函方法研究了二维过渡金属二硫属化合物（TMDC）材料的磁性，即Fe插层的体相Fe $_{1/4}$ TaS $_2$化合物和沉积Fe膜的TMDC单层材料.改变由TMDC单层上的Fe覆盖层组成的系统的结构和组成导致其物理性质的相当大的变化。对于所考虑的系统的Dzyaloshinskiii-Moriya（DM）的相互作用已被确定，并用于随后的调查，他们的磁结构使用蒙特卡罗模拟。在这些材料中的一些中已经获得了相当强的DM相互作用以及大的$D/J$比率，这可以导致形成随所施加的外部磁场的强度而变化的skyrmionic结构。
Termination-Dependent Surface States and Magnetic Fingerprints of Chiral Helimagnet Cr1/3TaS2
Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences（中国科学院物理研究所凝聚态物理北京实验室）；School of Physical Sciences, University of Chinese Academy of Sciences（中国科学院大学物理科学学院）；High-tech Institute, FanGong-ting South Street on the 12 th , Qingzhou, Shandong, China（山东省青州市范公亭南路12号高科技研究院）；Hefei National Laboratory（合肥国家实验室）
