论文标题
对称Wannier状态和用于量子旋转大厅乐队的紧密结合模型$ _2 $/WSE $ _2 $
Symmetric Wannier states and tight-binding model for quantum spin Hall bands in AB-stacked MoTe$_2$/WSe$_2$
论文作者
论文摘要
通过观察拓扑状态$ _2 $ _2 $/WSE $ _2 $的观察，我们为该系统中的量子旋转厅带构建了适应于对称性的Wannier状态和紧密结合模型。我们的构建基于对从连续莫伊尔顿式获得的Bloch状态的对称分析。对于从第一原理计算中提取的模型参数，我们发现可以通过在三角形晶格上定义的紧密结合模型来描述量子旋转大厅带。每个山谷有两个瓦尼尔状态，它们具有相同的Wannier中心，但在三倍旋转下具有不同的角动量。紧密结合模型不仅重现了能量谱，而且还准确地描述了由平面外排位场引起的拓扑相变。我们的研究为MoiréTransitionMetal DiChalcogenides双层的拓扑状态提供了新的启示，并提供了一种解决多体物理学的途径，以AB堆放的Mote $ _2 $ _2 $/WSE $ _2 $。
Motivated by the observation of topological states in AB-stacked MoTe$_2$/WSe$_2$, we construct the symmetry-adapted Wannier states and tight-binding model for the quantum spin Hall bands in this system. Our construction is based on the symmetry analysis of Bloch states obtained from the continuum moiré Hamiltonian. For model parameters extracted from first-principles calculations, we find that the quantum spin Hall bands can be described by a tight-binding model defined on a triangular lattice. There are two Wannier states per valley, which have the same Wannier center but different angular momenta under threefold rotation. The tight-binding model not only reproduces the energy spectrum, but also accurately describes the topological phase transition induced by the out-of-plane displacement field. Our study sheds new light on the topological states in moiré transition metal dichalcogenides bilayers, and provides a route to addressing the many-body physics in AB-stacked MoTe$_2$/WSe$_2$.
