论文标题
拓扑$ p_x+ip_y $ - valley cooherent cooherent inMoiréMote$ _2 $/WSE $ _2 $ HETEROBILAYERS
Topological $p_x+ip_y$ inter-valley coherent state in Moiré MoTe$_2$/WSe$_2$ heterobilayers
论文作者
论文摘要
最近，在AB堆放的MoiréMote$ _2 $/WSE $ _2 $ Heterobilayers中观察到了一个量子异常的大厅（QAH）状态。最新的层分辨磁圆二色性（MCD）测量表明，来自Mote $ _2 $和WSE $ _2 $层的自旋偏置Moiré频段在QAH状态的形成中涉及。现有理论不会期望这种情况。在这项工作中，我们建议观察到的QAH状态是一种新的物质状态，即拓扑$ p_x+ip_y $ valley inter-valley相干状态（TIVC）。我们指出，Mote $ _2 $Moiré乐队的巨大狄拉克频谱，以及Hund的互动，库仑的互动产生了这一小说的Qah State。通过自以为是的Hartree-fock分析，我们发现了$ P_X+IP_Y $ -Pairing阶段的各种交互强度和位移字段在能量上是有利的。除了解释实验的几个关键特征外，我们的理论还预测，该顺序参数将涉及电子和孔与确定的动量不匹配的配对，以使配对会产生一个新的单元单元，该单元是原始Moiré单位单元格的三倍，这是由于顺序参数参数调节。
Recently, a quantum anomalous Hall (QAH) state was observed in AB stacked moiré MoTe$_2$/WSe$_2$ heterobilayers at half-filling. More recent layer-resolved magnetic circular dichroism (MCD) measurements revealed that spin-polarized moiré bands from both the MoTe$_2$ and the WSe$_2$ layers are involved at the formation of the QAH state. This scenario is not expected by existing theories. In this work, we suggest that the observed QAH state is a new state of matter, namely, a topological $p_x+ip_y$ inter-valley coherent state (TIVC). We point out that the massive Dirac spectrum of the MoTe$_2$ moiré bands, together with the Hund's interaction and the Coulomb interactions give rise to this novel QAH state. Through a self-consistent Hartree-Fock analysis, we find a wide range of interaction strengths and displacement fields that the $p_x+ip_y$-pairing phase is energetically favourable. Besides explaining several key features of the experiments, our theory predicts that the order parameter would involve the pairing of electrons and holes with a definite momentum mismatch such that the pairing would generate a new unit cell which is three times the size of the original moiré unit cell, due to the order parameter modulations.
