论文标题
观察twisted Biyer WSE $ _2 $的平面$γ$Moiré乐队
Observation of flat $Γ$ moiré bands in twisted bilayer WSe$_2$
论文作者
论文摘要
最近观察到整数和分数填充的过渡金属二甲基元素Moiré系统中的相关阶段有望对金属 - 绝缘体过渡和可能在此类过渡附近出现的异常状态进行新的见解。在这里，我们将实地和动量空间映射技术结合在一起，以57.4 $^{\ circ} $扭曲的WSE WSE $ _2 $（TWSE $ _2 $）研究Moiré超晶格效果。我们的数据揭示了一条分裂的平坦频段，该频段源自单层$γ$状态。使用高级数据分析，我们直接从数据中量化了Moiré潜力。我们进一步证明，二十$ _2 $中的全球价频段最大值与该平坦频段的能量接近，但源自单层K-states，它们显示出较弱的超晶格效果。这些结果限制了理论模型，并打开了一个观点，即$γ$ -VALLEY FLAT乐队可能参与了扭曲的WSE $ _2 $的相关物理。
The recent observation of correlated phases in transition metal dichalcogenide moiré systems at integer and fractional filling promises new insight into metal-insulator transitions and the unusual states of matter that can emerge near such transitions. Here, we combine real- and momentum-space mapping techniques to study moiré superlattice effects in 57.4$^{\circ}$ twisted WSe$_2$ (tWSe$_2$). Our data reveal a split-off flat band that derives from the monolayer $Γ$ states. Using advanced data analysis, we directly quantify the moiré potential from our data. We further demonstrate that the global valence band maximum in tWSe$_2$ is close in energy to this flat band but derives from the monolayer K-states which show weaker superlattice effects. These results constrain theoretical models and open the perspective that $Γ$-valley flat bands might be involved in the correlated physics of twisted WSe$_2$.
