论文标题
用石墨烯/MOTE $ _2 $ van der waals异质结构
Ferroelectric valley valves with graphene/MoTe$_2$ van der Waals heterostructures
论文作者
论文摘要
铁电范德华异质结构提供了设计各种电气控制设备的自然平台。在这项工作中，我们证明了封装在Mote $ _2 $中的AB BiLayer石墨烯充当一个山谷阀，显示出可切换的内置拓扑间隙，从而导致铁电动驱动的拓扑通道。使用从头算计算和低能模型的组合，我们表明，MOTE $ _2 $的铁电顺序允许控制双层石墨烯中的间隙开口，并导致不同铁电域之间的拓扑通道。此外，我们分析了MOTE $ _2 $和石墨烯层之间的Moiré调制在拓扑模式中具有的作用，表明边缘状态与铁电诱导的电位的Moiré调制具有强大的稳定性。我们的结果提出了铁电/石墨烯异质结构，作为用于工程可切换内置拓扑通道的多功能平台，而无需外部电动偏置。
Ferroelectric van der Waals heterostructures provide a natural platform to design a variety of electrically controllable devices. In this work, we demonstrate that AB bilayer graphene encapsulated in MoTe$_2$ acts as a valley valve that displays a switchable built-in topological gap, leading to ferroelectrically driven topological channels. Using a combination of ab initio calculations and low energy models, we show that the ferroelectric order of MoTe$_2$ allows the control of the gap opening in bilayer graphene and leads to topological channels between different ferroelectric domains. Moreover, we analyze the effect that the moiré modulation between MoTe$_2$ and graphene layers has in the topological modes, demonstrating that the edge states are robust against moiré modulations of the ferroelectrically-induced electric potential. Our results put forward ferroelectric/graphene heterostructures as versatile platforms to engineer switchable built-in topological channels without requiring an external electric bias.
