Extremely large magnetoresistance in twisted intertwined graphene spirals

Yiwen Zhang, Bo Xie, Yue Yang, Yueshen Wu, Xin Lu, Yuxiong Hu, Yifan Ding, Jiadian He, Peng Dong, Jinghui Wang, Xiang Zhou, Jianpeng Liu (), Zhu-Jun Wang () and Jun Li ()
Additional contact information
Yiwen Zhang: ShanghaiTech University
Bo Xie: ShanghaiTech University
Yue Yang: ShanghaiTech University
Yueshen Wu: ShanghaiTech University
Xin Lu: ShanghaiTech University
Yuxiong Hu: ShanghaiTech University
Yifan Ding: ShanghaiTech University
Jiadian He: ShanghaiTech University
Peng Dong: ShanghaiTech University
Jinghui Wang: ShanghaiTech University
Xiang Zhou: ShanghaiTech University
Jianpeng Liu: ShanghaiTech University
Zhu-Jun Wang: ShanghaiTech University
Jun Li: ShanghaiTech University

Nature Communications, 2024, vol. 15, issue 1, 1-9

Abstract: 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 × 107%, 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.

Date: 2024
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DOI: 10.1038/s41467-024-50456-0

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