扭转TMD双层中双带有效模型内配对态的拓扑性质与能隙结构
Topological properties and gap structure of the paired state in twisted TMD bilayers within a two-band effective model
- Academic Centre for Materials and Nanotechnology, AGH University of Krakow（克拉科夫AGH大学材料与纳米技术学术中心）
机构由 AI 辅助整理，请以论文原文为准。
AI总结：
本研究基于扭转TMD双层实验，采用双带Kane-Mele类模型在Hartree-Fock层面研究配对态，分析能隙对称性、稳定性及超导与拓扑的相互作用，揭示相图形成机制。
AI中文摘要：
我们提出了一项理论研究，其动机来自最近的实验结果，这些实验展示了从扭转过渡金属二硫属化物（TMD）双层的平坦拓扑带中涌现的超导性。为了捕捉系统非平凡的能带拓扑，我们采用了一个有效的双带Kane-Mele类模型，并在Hartree-Fock平均场层面将其与库仑排斥和格点间配对相互作用相结合。假设实空间配对情景，我们分析了作为能带填充和施加位移场函数的超导能隙对称性及配对态的稳定性。最后，我们强调了超导性与非平凡拓扑之间的相互作用，详细说明了相互作用诱导效应和态密度的演化如何塑造最终的超导相图。
英文摘要：
We present a theoretical study motivated by the recent experimental results which demonstrate superconductivity emerging from flat topological bands of twisted transition metal dichalcogenide (TMD) bilayers. To capture the non-trivial band topology of the system, we employ an effective two-band Kane-Mele-like model and substitute it with Coulomb repulsion and inter-site pairing interactions treated at the Hartree-Fock mean-field level. Assuming a real-space pairing scenario, we analyze the resulting superconducting gap symmetry and the stability of the paired state as a function of band filling and applied displacement field. Finally, we highlight the interplay between superconductivity and non-trivial topology, detailing how interaction-induced effects and the evolution of the density of states shape the resulting superconducting phase diagram.
