论文标题
反转对称扭曲的范德华异质结构中的可调超导性和möbiusfermi表面
Tunable superconductivity and Möbius Fermi surfaces in an inversion-symmetric twisted van der Waals heterostructure
论文作者
论文摘要
从理论上讲，我们研究了一个由镜子对称的扭曲三层石墨烯组成的Moiré超晶格几何形状，该石墨烯被相同的过渡金属二甲藻元化层所包围。我们表明，这种设置允许打开/关闭，并通过应用垂直位移字段$ d_0 $来控制费米表面的自旋轨道分裂，并探索此控件的两个表现形式：首先，我们计算超导通的演变与$ d_0 $ $ d_0 $;这具有单重线和三重态配对的复杂混合物，并取决于父三层系统中的配对状态，在竞争超导阶段之间进行了相变。其次，我们揭示，随着$ d_0 $的应用，旋转轨道诱导的旋转纹理表现出涡流，导致“莫比乌斯·费米（MöbiusFermi）表面”在布里鲁因区域内部：糖尿病电子轨迹，预计这些轨迹预计这些轨迹可预测，这些轨迹将构成量子振荡实验，需要$γ$ copt twice twice，我们将量子归因于$ copt twice，我们会直接绕过twicius。超导顺序参数继承了非常规的莫比乌斯自旋纹理。
We study theoretically a moiré superlattice geometry consisting of mirror-symmetric twisted trilayer graphene surrounded by identical transition metal dichalcogenide layers. We show that this setup allows to switch on/off and control the spin-orbit splitting of the Fermi surfaces via application of a perpendicular displacement field $D_0$, and explore two manifestations of this control: first, we compute the evolution of superconducting pairing with $D_0$; this features a complex admixture of singlet and triplet pairing and, depending on the pairing state in the parent trilayer system, phase transitions between competing superconducting phases. Second, we reveal that, with application of $D_0$, the spin-orbit-induced spin textures exhibit vortices which lead to "Möbius fermi surfaces'' in the interior of the Brillouin zone: diabatic electron trajectories, which are predicted to dominate quantum oscillation experiments, require encircling the $Γ$ point twice, making their Möbius nature directly observable. We further show that the superconducting order parameter inherits the unconventional, Möbius spin textures. Our findings suggest that this system provides a promising experimental avenue for studying systematically the impact of spin-orbit coupling on the multitude of topological and correlated phases in near-magic-angle twisted trilayer graphene.
