论文标题
具有双边界的菱形石墨烯多层中电子的扁平带
Flat bands for electrons in rhombohedral graphene multilayers with a twin boundary
论文作者
论文摘要
受拓扑保护的平面波段使菱形石墨的薄膜成为一个吸引人的平台，用于寻找2D电子的密切相关状态。在这项工作中，我们研究了具有双边界堆叠断层的菱形石墨，并分析了位于表面和双界面处的低能量带的半金属和拓扑特性。我们得出了一个有效的4波段低能模型，在该模型中，我们实施了整个Slonczewski-Weiss-McClure（SWMCC）参数，并找到了频段定位在双边界上的频段的条件，并免受环境诱导的疾病的影响。这种保护以及在电荷中立点处的高密度状态，在某些情况下 - 由于Lifshitz的过渡，该系统使该系统成为托管强烈相关效应的有前途的候选人。
Topologically protected flat surface bands make thin films of rhombohedral graphite an appealing platform for searching for strongly correlated states of 2D electrons. In this work, we study rhombohedral graphite with a twin boundary stacking fault and analyse the semimetallic and topological properties of low-energy bands localised at the surfaces and at the twinned interface. We derive an effective 4-band low energy model, where we implement the full set of Slonczewski-Weiss-McClure (SWMcC) parameters, and find the conditions for the bands to be localised at the twin boundary, protected from the environment-induced disorder. This protection together with a high density of states at the charge neutrality point, in some cases -- due to a Lifshitz transition, makes this system a promising candidate for hosting strongly-correlated effects.
