Heteromoiré Engineering on Magnetic Bloch Transport in Twisted Graphene Superlattices

Fanrong Lin, Jiabin Qiao, Junye Huang, Jiawei Liu, Deyi Fu, Alexander S. Mayorov, Hao Chen, Paromita Mukherjee, Tingyu Qu, Chorng Haur Sow, Kenji Watanabe, Takashi Taniguchi, Barbaros Özyilmaz*

*此作品的通讯作者

科研成果: 期刊稿件文章同行评审

9 引用 (Scopus)

摘要

Localized electrons subject to applied magnetic fields can restart to propagate freely through the lattice in delocalized magnetic Bloch states (MBSs) when the lattice periodicity is commensurate with the magnetic length. Twisted graphene superlattices with moiré wavelength tunability enable experimental access to the unique delocalization in a controllable fashion. Here, we report the observation and characterization of high-temperature Brown-Zak (BZ) oscillations which come in two types, 1/B and B periodicity, originating from the generation of integer and fractional MBSs, in the twisted bilayer and trilayer graphene superlattices, respectively. Coexisting periodic-in-1/B oscillations assigned to different moiré wavelengths are dramatically observed in small-angle twisted bilayer graphene, which may arise from angle-disorder-induced in-plane heteromoiré superlattices. Moreover, the vertical stacking of heteromoiré supercells in double-twisted trilayer graphene results in a mega-sized superlattice. The exotic superlattice contributes to the periodic-in-B oscillation and dominates the magnetic Bloch transport.

源语言英语
页(从-至)7572-7579
页数8
期刊Nano Letters
20
10
DOI
出版状态已出版 - 14 10月 2020
已对外发布

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