论文标题
固有的量子异常霍尔阶段是由德国邻近/cr $ _2 $ ge $ _2 $ _2 $ _6 $ van der wa a waals杂质诱导的
Intrinsic quantum anomalous Hall phase induced by proximity in germanene/Cr$_2$Ge$_2$Te$_6$ van der Waals heterostructure
论文作者
论文摘要
范德华（Van der Waals）的异质结构与内在的磁性和拓扑顺序相结合，最近铺平了有吸引力的途径，以实现量子异常的效果。在这项工作中，使用第一原理计算和有效的模型分析，我们建议在van der waalse dermanene/cr $ _2 $ _2 $ ge $ _2 $ _2 $ te $ _6 $的范德华异质结构中出现了强大的量子异常霍尔状态。该异质结构具有较高的热力学稳定性，从而促进了其实验性制造。此外，我们发现近距离效应增强了德国烯和Cr $ _2 $ ge $ _2 $ _2 $ _6 $层之间的耦合，从而诱导了从29 MEV到72 MEV的非平凡频段差距。在乐队间隙内部的手性边缘状态清晰可见到$ -E^2/h $的霍尔电导。这一发现为检测量子异常的大厅状态提供了理想的候选者，并在高温下实现了非平凡量子运输的进一步应用。
A van der Waals heterostructure combined with intrinsic magnetism and topological orders have recently paved attractive avenues to realize quantum anomalous Hall effects. In this work, using first-principles calculations and effective model analysis, we propose that the robust quantum anomalous Hall states with sizable band gaps emerge in the van der Waals heterostructure of germanene/Cr$_2$Ge$_2$Te$_6$. This heterostructure possesses high thermodynamic stability, thus facilitating its experimental fabrication. Furthermore, we uncover that the proximity effect enhances the coupling between the germanene and Cr$_2$Ge$_2$Te$_6$ layers, inducing the nontrivial band gaps in a wide range from 29 meV to 72 meV. The chiral edge states inside the band gap, leading to Hall conductance quantized to $-e^2/h$, are clearly visible. This findings provide an ideal candidate to detect the quantum anomalous Hall states and realize further applications to nontrivial quantum transport at a high temperature.
