journal article·2017-06-27Open access

Electronic Coupling between Graphene and Topological Insulator Induced Anomalous Magnetotransport Properties

Liang Zhang, Ben-Chuan Lin, Yan-Fei Wu, Han-Chun Wu, Tsung-Wei Huang, Ching-Ray Chang, Xiaoxing Ke, Mert Kurttepeli, Gustaaf Van Tendeloo, Jun Xu, Dapeng Yu, Zhi-Min Liao

ACS Nano· Volume 11· Issue 6

Abstract

It has been theoretically proposed that the spin textures of surface states in a topological insulator can be directly transferred to graphene by means of the proximity effect, which is very important for realizing a two-dimensional topological insulator based on graphene. Here we report the anomalous magnetotransport properties of graphene–topological insulator Bi2Se3 heterojunctions, which are sensitive to the electronic coupling between graphene and the topological surface state. The coupling between the pz orbitals of graphene and the p orbitals of the surface states on the Bi2Se3 bottom surface can be enhanced by applying a perpendicular negative magnetic field, resulting in a giant negative magnetoresistance at the Dirac point up to about −91%. An obvious resistance dip in the transfer curve at the Dirac point is also observed in the hybrid devices, which is consistent with theoretical predictions of the distorted Dirac bands with nontrivial spin textures inherited from the Bi2Se3 surface states.
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Research context

OpenAlex topics: Topological Materials and Phenomena · Graphene research and applications · 2D Materials and Applications

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

State Key Laboratory for Mesoscopic Physics, School of Physics, Peking University, Beijing 100871, China

School of Physics, Beijing Institute of Technology, Beijing 100081, China

Department of Physics, National Taiwan University, Taipei 10617, Taiwan

Institute of Microstructures and Properties of Advanced Materials, Beijing University of Technology, Beijing 100124, China

EMAT (Electron Microscopy for Materials Science), University of Antwerp, Groenenborgerlaan 171, B-2020 Antwerp, Belgium

Electron Microscopy Laboratory, School of Physics, Peking University, Beijing 100871, China

Department of Physics, South University of Science and Technology of China, Shenzhen 518055, China

Collaborative Innovation Center of Quantum Matter, Beijing 100871, China

Funding

Ministry of Science and Technology of the People's Republic of China · National Natural Science Foundation of China

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