论文标题
在扭曲的过渡金属二核苷中观察γ-谷Loiré带和新兴的六角形晶格
Observation of Γ-valley moiré bands and emergent hexagonal lattice in twisted transition metal dichalcogenides
论文作者
论文摘要
最近，由于低能量的Moiré频段，扭曲的范德华异质结构是一个凝结的量子模型，用于实现可控的量子模型，该平台在Moiré超级晶格中具有特定的电荷分布。在这里，将角度分辨光发射光谱与亚微米空间分辨率（μ-arpes）和扫描隧道显微镜（STM）结合在一起，我们对5.1°扭曲的双层WSE2的电子结构进行了系统研究，以宿主与绝缘和零相关。有趣的是，与一个人的期望相反，仅在γ-Valley观察到Moiré带，而在μArpes测量中不观察到K-Valley。相应地，我们的STM测量值清楚地识别了与γ-ValleyMoiré频段相关的Moiré长度尺度上的真实空间蜂窝状和kagome形的电荷分布。这些结果不仅揭示了扭曲的过渡金属二分法中依赖的山谷依赖性莫伊尔修饰的电子结构，而且还突出了γ-谷Leymoiré带作为探索不同能量尺度上出现的蜂窝和kagome lattices中紧密相关的物理学的有前途的平台。
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 in moiré superlattices. Here, combining angle-resolved photoemission spectroscopy with sub-micron 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 unsual 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.
