论文标题
多卵形链条可调性和自旋轨道耦合在扭曲的双层过渡金属二进制中的效果
Multi-ultraflatbands tunability and effect of spin-orbit coupling in twisted bilayer transition metal dichalcogenides
论文作者
论文摘要
在一堆范德华堆叠的材料中，在理论上和实验上检测到的超fla频带，显示了一些特性，例如高度局部的电子状态和增强的电子电子相互作用。在该字母中，使用准确的紧密结合模型，我们研究了在低旋转角度下过渡金属二核苷（TMDC）中超fl链的形成和演变。我们发现，与扭曲的双层石墨烯不同，TMDC中存在超fl曲线，几乎所有小扭曲角度，当旋转角度降低时，它们的波函数就会更加局部。晶格松弛，压力和局部变形可以调整平带的宽度及其定位。此外，我们研究了自旋轨道耦合对平板的效果，并在布里鲁因区域的K点的最小传导带中发现自旋/轨道/山谷锁定。在TMDC中发现的旋转角度范围低于$ 7^\ Circ $的Ultraflatbands可以提供一个理想的研究平台，以研究密切相关的状态。
Ultraflatbands that have been theoretically and experimentally detected in a bunch of van der Waals stacked materials showing some peculiar properties, for instance, highly localized electronic states and enhanced electron-electron interactions. In this Letter, using an accurate tight-binding model, we study the formation and evolution of ultraflatbands in transition metal dichalcogenides (TMDCs) under low rotation angles. We find that, unlike in twisted bilayer graphene, ultraflatbands exist in TMDCs for almost any small twist angles and their wave function becomes more localized when the rotation angle decreases. Lattice relaxation, pressure and local deformation can tune the width of the flatbands, as well as their localization. Furthermore, we investigate the effect of spin-orbit coupling on the flatbands and discover spin/orbital/valley locking at the minimum of the conduction band at the K point of the Brillouin zone. The ultraflatbands found in TMDCs with a range of rotation angle below $7^\circ$, may provide an ideal platform to study strongly correlated states.
