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Observation ofΓ-Valley Moiré Bands and Emergent Hexagonal Lattice in Twisted Transition Metal Dichalcogenides
Physical Review X ( IF 12.5 ) Pub Date : 2022-06-24 , DOI: 10.1103/physrevx.12.021065
Ding Pei, Binbin Wang, Zishu Zhou, Zhihai He, Liheng An, Shanmei He, Cheng Chen, Yiwei Li, Liyang Wei, Aiji Liang, Jose Avila, Pavel Dudin, Viktor Kandyba, Alessio Giampietri, Mattia Cattelan, Alexei Barinov, Zhongkai Liu, Jianpeng Liu, Hongming Weng, Ning Wang, Jiamin Xue, Yulin Chen

Twisted van der Waals heterostructures have recently been proposed as a condensed-matter platform for realizing controllable quantum models due to the low-energy moiré bands with specific charge distributions moiré superlattices. Here, combining angle-resolved photoemission spectroscopy with submicron spatial resolution (μ-ARPES) and scanning tunneling microscopy (STM), we performed a systematic investigation on the electronic structure of 5.1° twisted bilayer WSe2 that hosts correlated insulating and zero-resistance states. Interestingly, contrary to one’s expectation, moiré bands were observed only at Γ valley but not K valley in μ-ARPES measurements, and correspondingly, our STM measurements clearly identified the real-space honeycomb- and kagome-shaped charge distributions at the moiré length scale associated with the Γ-valley moiré bands. These results not only reveal the unusual valley-dependent moiré-modified electronic structure in twisted transition metal dichalcogenides, but also highlight the Γ-valley moiré bands as a promising platform for exploring strongly correlated physics in emergent honeycomb and kagome lattices at different energy scales.

中文翻译:

在扭曲的过渡金属二硫属化物中观察Γ-谷莫尔带和出现的六方晶格

由于具有特定电荷分布的莫尔超晶格的低能量莫尔带,最近提出了扭曲范德华异质结构作为实现可控量子模型的凝聚态物质平台。在这里,将角分辨光电子能谱与亚微米空间分辨率相结合(μ-ARPES)和扫描隧道显微镜(STM),我们对5.1°扭曲双层的电子结构进行了系统研究WSe2承载相关的绝缘和零电阻状态。有趣的是,出乎意料的是,莫尔条纹仅在Γ谷而不是ķ山谷μ-ARPES 测量,相应地,我们的 STM 测量清楚地确定了与Γ-山谷莫尔条纹。这些结果不仅揭示了扭曲的过渡金属二硫属化物中不寻常的依赖于谷的莫尔修饰电子结构,而且突出了Γ- 谷莫尔带作为探索不同能量尺度的新兴蜂窝和kagome晶格中强相关物理的有前景的平台。
更新日期:2022-06-24
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