Extremely large magnetoresistance in twisted intertwined graphene spirals

YW Zhang and B Xie and Y Yang and YS Wu and X Lu and YX Hu and YF Ding and JD He and P Dong and JH Wang and X Zhou and JP Liu and ZJ Wang and J Li, NATURE COMMUNICATIONS, 15, 6120 (2024).

DOI: 10.1038/s41467-024-50456-0

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 moire 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 degrees. Notably, at 14 T and 2 K, the magnetoresistance of these structures reaches 1.7x10(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 moire systems.

Return to Publications page