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Observation of a Chern insulator in crystalline ABCA-tetralayer graphene with spin-orbit coupling.
Sha, Yating; Zheng, Jian; Liu, Kai; Du, Hong; Watanabe, Kenji; Taniguchi, Takashi; Jia, Jinfeng; Shi, Zhiwen; Zhong, Ruidan; Chen, Guorui.
Afiliación
  • Sha Y; Key Laboratory of Artificial Structures and Quantum Control (Ministry of Education), Shenyang National Laboratory for Materials Science, School of Physics and Astronomy, Shanghai Jiao Tong University, Shanghai 200240, China.
  • Zheng J; Key Laboratory of Artificial Structures and Quantum Control (Ministry of Education), Shenyang National Laboratory for Materials Science, School of Physics and Astronomy, Shanghai Jiao Tong University, Shanghai 200240, China.
  • Liu K; Key Laboratory of Artificial Structures and Quantum Control (Ministry of Education), Shenyang National Laboratory for Materials Science, School of Physics and Astronomy, Shanghai Jiao Tong University, Shanghai 200240, China.
  • Du H; Tsung-Dao Lee Institute, Shanghai Jiao Tong University, Shanghai, 201210, China.
  • Watanabe K; Research Center for Electronic and Optical Materials, National Institute for Materials Science, Tsukuba 305-0044, Japan.
  • Taniguchi T; Research Center for Materials Nanoarchitectonics, National Institute for Materials Science, Tsukuba 305-0044, Japan.
  • Jia J; Key Laboratory of Artificial Structures and Quantum Control (Ministry of Education), Shenyang National Laboratory for Materials Science, School of Physics and Astronomy, Shanghai Jiao Tong University, Shanghai 200240, China.
  • Shi Z; Tsung-Dao Lee Institute, Shanghai Jiao Tong University, Shanghai, 201210, China.
  • Zhong R; Key Laboratory of Artificial Structures and Quantum Control (Ministry of Education), Shenyang National Laboratory for Materials Science, School of Physics and Astronomy, Shanghai Jiao Tong University, Shanghai 200240, China.
  • Chen G; Tsung-Dao Lee Institute, Shanghai Jiao Tong University, Shanghai, 201210, China.
Science ; 384(6694): 414-419, 2024 Apr 26.
Article en En | MEDLINE | ID: mdl-38662836
ABSTRACT
Degeneracies in multilayer graphene, including spin, valley, and layer degrees of freedom, can be lifted by Coulomb interactions, resulting in rich broken-symmetry states. Here, we report a ferromagnetic state in charge-neutral ABCA-tetralayer graphene driven by proximity-induced spin-orbit coupling from adjacent tungsten diselenide. The ferromagnetic state is identified as a Chern insulator with a Chern number of 4; its maximum Hall resistance reaches 78% quantization at zero magnetic field and is fully quantized at either 0.4 or -1.5 tesla. Three distinct broken-symmetry insulating states, layer-antiferromagnet, Chern insulator, and layer-polarized insulator, along with their transitions, can be continuously tuned by the vertical displacement field. In this system, the magnetic order of the Chern insulator can be switched by three knobs, including magnetic field, electrical doping, and vertical displacement field.
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Idioma: En Revista: Science Año: 2024 Tipo del documento: Article País de afiliación: China Pais de publicación: Estados Unidos
Texto completo
Añadir a Mi BVS
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Idioma: En Revista: Science Año: 2024 Tipo del documento: Article País de afiliación: China Pais de publicación: Estados Unidos