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Giant orbital magnetoelectric effect and current-induced magnetization switching in twisted bilayer graphene

He, Wen-Yu ; Goldhaber-Gordon, David ; Law, K T

Nature communications, 2020-04, Vol.11 (1), p.1650-1650, Article 1650 [Periódico revisado por pares]

England: Nature Publishing Group

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  • Título:
    Giant orbital magnetoelectric effect and current-induced magnetization switching in twisted bilayer graphene
  • Autor: He, Wen-Yu ; Goldhaber-Gordon, David ; Law, K T
  • Assuntos: Bilayers ; Broken symmetry ; CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS ; Energy dissipation ; Ferromagnetism ; Graphene ; Magnetic moments ; Magnetism ; Magnetization ; MATERIALS SCIENCE ; Quantum Hall effect ; Substrates ; Switching ; Twisting
  • É parte de: Nature communications, 2020-04, Vol.11 (1), p.1650-1650, Article 1650
  • Notas: ObjectType-Article-1
    SourceType-Scholarly Journals-1
    ObjectType-Feature-2
    content type line 23
    USDOE Office of Science (SC), Basic Energy Sciences (BES)
    AC02-76SF00515
  • Descrição: Recently, quantum anomalous Hall effect with spontaneous ferromagnetism was observed in twisted bilayer graphenes (TBG) near 3/4 filling. Importantly, it was observed that an extremely small current can switch the direction of the magnetization. This offers the prospect of realizing low energy dissipation magnetic memories. However, the mechanism of the current-driven magnetization switching is poorly understood as the charge currents in graphenes are generally believed to be non-magnetic. In this work, we demonstrate that in TBG, the twisting and substrate induced symmetry breaking allow an out of plane orbital magnetization to be generated by a charge current. Moreover, the large Berry curvatures of the flat bands give the Bloch electrons large orbital magnetic moments so that a small current can generate a large orbital magnetization. We further demonstrate how the charge current can switch the magnetization of the ferromagnetic TBG near 3/4 filling as observed in the experiments.
  • Editor: England: Nature Publishing Group
  • Idioma: Inglês
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  • Realização: ABCD-USP USP   Logos de Redes Sociais: Freepik

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