发表机构
School of Physics and Technology, Nanjing Normal University（南京师范大学物理科学与技术学院）
机构由 AI 辅助整理，请以论文原文为准。AI 中文总结
本研究针对ABC堆垛菱面多层石墨烯，揭示拓扑谷扭结态的层极化特性，发现垂直磁场可通过打破其层对称分布抑制谷间散射，增强其无序区透射率，为操控该态传播提供有效途径。
AI 中文摘要
拓扑谷扭结态（VKSs）是在具有相反谷陈数的相邻畴界出现的量子谷霍尔态，在石墨烯基体系中已受到大量关注。本工作研究ABC堆垛菱面多层石墨烯中，在安德森无序和垂直磁场存在下VKSs的量子输运，揭示两个显著输运特征：第一，无磁场时，扭结态呈现强层极化，其波函数主要局域且均等分布在最外层顶、底层，因此其输运特性对层选择性无序分布高度敏感；第二，垂直磁场下，VKSs的层对称空间分布被打破，导致相反谷的反向传播VKSs间波函数重叠显著减少，从而抑制谷间散射，大幅提升VKSs穿过无序区域的透射率。本研究结果为菱面多层石墨烯的多通道拓扑谷输运提供新见解，并证明无序工程和磁场是操控VKSs传播的有效方法。
英文摘要
Topological valley kink states (VKSs), which are quantum valley Hall states emerging at the interfaces between adjacent domains with opposite valley Chern numbers, have attracted considerable interest in graphene-based systems. In this work, we investigate the quantum transport of VKSs in ABC-stacked rhombohedral multilayer graphene in the presence of Anderson disorder and a perpendicular magnetic field. Two prominent transport characteristics are revealed. First, in the absence of a magnetic field, the kink states exhibit strong layer polarization, with their wave functions predominantly localized and equally distributed on the outermost top and bottom layers. As a result, their transport properties are highly sensitive to the layer-selective disorder distribution. Second, under a perpendicular magnetic field, the layer-symmetric spatial distribution of VKSs is broken, leading to a significant reduction in the wave-function overlap between counter-propagating VKSs from opposite valleys. Consequently, intervalley scattering is suppressed, and the transmission of VKSs through disordered regions is substantially enhanced. Our results provide new insights into multichannel topological valley transport in rhombohedral multilayer graphene and demonstrates disorder-engineering and magnetic fields as effective approaches for manipulating the propagation of VKSs.
Comments12 pages, 9 figures
