Artigo Revisado por pares

Fractional and Symmetry-Broken Chern Insulators in Tunable Moiré Superlattices

2019; American Chemical Society; Volume: 19; Issue: 7 Linguagem: Inglês

10.1021/acs.nanolett.9b00811

ISSN

1530-6992

Autores

Bin Cheng, Cheng Pan, Shi Che, Peng Wang, Yong Wu, Kenji Watanabe, Takashi Taniguchi, Supeng Ge, Roger K. Lake, Dmitry Smirnov, Chun Ning Lau, Marc Bockrath,

Tópico(s)

Metamaterials and Metasurfaces Applications

Resumo

We study dual-gated graphene bilayer/hBN moiré superlattices. Under zero magnetic field, we observe additional resistance peaks as the charge density varies. The peaks' resistivities vary approximately quadratically with an applied perpendicular displacement field D. Data fit to a continuum model yield a bilayer/hBN interaction energy scale ∼30 ± 10 meV. Under a perpendicular magnetic field, we observe Hofstadter butterfly spectra as well as symmetry-broken and fractional Chern insulator states. Their topology and lattice symmetry breaking is D-tunable, enabling the realization of new topological states in this system.

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