Magnetism near half-filling of a Van Hove singularity in twisted graphene bilayer

Yi Wen Liu, Jia Bin Qiao, Chao Yan, Yu Zhang, Si Yu Li, Lin He*

*此作品的通讯作者

科研成果: 期刊稿件文章同行评审

33 引用 (Scopus)

摘要

Twisted graphene bilayers (TGBs) with slight twist angle always have low-energy Van Hove singularities (VHSs) that are strongly localized around AA-stacked regions of the moiré pattern. The localized VHSs are strongly related to novel correlated quantum states, such as Mott-like insulating phase and unconventional superconductivity, observed in the slightly TGBs. Here we studied the electronic properties of a TGB with θ∼1.64 and demonstrated that a VHS splits into two spin-polarized states flanking the Fermi energy when the VHS is close to the Fermi level. Such a result indicates that localized magnetic moments emerge in the AA-stacked regions of the TGB. Since the low-energy VHSs can be reached in slightly TGBs, our result therefore provides a facile direction to realize novel quantum phases in graphene system.

源语言英语
文章编号201408
期刊Physical Review B
99
20
DOI
出版状态已出版 - 9 5月 2019
已对外发布

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