Extremely large magnetoresistance in twisted intertwined graphene spirals

作者：Yiwen Zhang, Bo Xie, Yue Yang, Yueshen Wu, Xin Lü, Yuxiong Hu, Yifan Ding, Jiadian He, Peng Dong, Jinghui Wang, Xiang Zhou, Jianpeng Liu, Zhu‐Jun Wang, Jun Li · 发表于：Nature Communications · 年份：2024 · DOI：10.1038/s41467-024-50456-0 · 被引用次数：8 · 研究领域：Graphene research and applications、Topological Materials and Phenomena、Quantum and electron transport phenomena

Abstract Extremely large magnetoresistance (XMR) is highly applicable in spintronic devices such as magnetic sensors, magnetic memory, and hard drives. Typically, XMR is found in Weyl semimetals characterized by perfect electron–hole symmetry or exceptionally high electric conductivity and mobility. Our study explores this phenomenon in a recently developed graphene moiré system, which demonstrates XMR owing to its topological structure and high-quality crystal formation. We investigate the electronic properties of three-dimensional intertwined twisted graphene spirals (TGS), manipulating the screw dislocation axis to achieve a rotation angle of 7.3°. Notably, at 14 T and 2 K, the magnetoresistance of these structures reaches 1.7 × 10 7 %, accompanied by a metal–insulator transition as the temperature increases. This transition becomes noticeable when the magnetic field exceeds a minimal threshold of approximately 0.1 T. These observations suggest the possible existence of complex, correlated states within the partially filled three-dimensional Landau levels of the 3D TGS system. Our findings open up possibilities for achieving XMR by engineering the topological structure of 2D layered moiré systems.