AI 中文总结
研究扭曲单层/双层WSe₂中Γ谷和K谷莫尔物理，通过位移场调谐实现不同谷的莫尔物理，对比了ν = 1和ν = 1/3时相关相，强调轨道特性对量子相的重要性，确定Γ谷是探索量子相变附近相关现象的平台。
AI 中文摘要
电子轨道特性在决定凝聚态系统的电子关联、自旋轨道耦合、维度以及最终的量子相方面起着核心作用。二维莫尔材料已成为探索相关现象的高度可调平台，但轨道自由度的作用在很大程度上仍未被探索。本文中，我们确定扭曲单层/双层WSe₂是一个平台，其中位移场调谐使莫尔物理能够在K谷和Γ谷中实现。这些谷的不同轨道特性在莫尔填充因子ν = 1和ν = 1/3时产生了对比鲜明的相关相。在ν = 1时，K谷态是弱绝缘体，与中间耦合 regime中范霍夫奇点附近的反铁磁态一致，类似于在扭曲双层WSe₂中观察到的情况。相比之下，Γ谷态表现出明显的波梅兰丘克效应，与接近莫特转变一致。在ν = 1/3时，K谷存在稳健的广义维格纳晶体，而Γ谷态位于结晶边界附近，并再次表现出波梅兰丘克效应，随着温度或磁场的增加，局域化增强。我们的工作强调了轨道特性在定义莫尔系统量子相中的重要性，并将Γ谷确定为探索量子相变附近相关现象的有前途的平台，其中竞争相和增强的涨落可能导致非常规相。
英文摘要
Electronic orbital character plays a central role in determining electronic correlations, spin-orbit coupling, dimensionality, and ultimately the quantum phases of condensed-matter systems. Two-dimensional moiré materials have emerged as highly tunable platforms for exploring correlated phenomena, but the role of orbital degrees of freedom remains largely unexplored. Here, we identify twisted monolayer/bilayer WSe$_2$ as a platform in which displacement-field tuning enables moiré physics to be realized in both the $K$ and $Γ$ valleys. The distinct orbital characters of these valleys give rise to contrasting correlated phases at moiré filling factors $ν=1$ and $ν=1/3$. At $ν=1$, the $K$-valley state is a weak insulator, consistent with an antiferromagnetic state near a van Hove singularity in the intermediate-coupling regime, similar to that observed in twisted bilayer WSe$_2$. In contrast, the $Γ$-valley state exhibits a pronounced Pomeranchuk effect, consistent with proximity to a Mott transition. At $ν=1/3$, the $K$ valley hosts a robust generalized Wigner crystal, whereas the $Γ$-valley state lies near the crystallization boundary and again exhibits a Pomeranchuk effect, with localization enhanced by increasing temperature or magnetic field. Our work highlights the importance of orbital character in defining quantum phases in moiré systems, and identify the $Γ$ valley as a promising platform for exploring correlated phenomena near quantum phase transitions, where competing phases and enhanced fluctuations may give rise to unconventional phases.
