Flat Chern Band from Twisted Bilayer MnBi2Te4

Biao Lian, Zhaochen Liu, Yuanbo Zhang, Jing Wang

Research output: Contribution to journalArticlepeer-review

7 Scopus citations

Abstract

We construct a continuum model for the moiré superlattice of twisted bilayer MnBi2Te4, and study the band structure of the bilayer in both ferromagnetic (FM) and antiferromagnetic (AFM) phases. We find the system exhibits highly tunable Chern bands with Chern number up to 3. We show that a twist angle of 1° turns the highest valence band into a flat band with Chern number ±1 that is isolated from all other bands in both FM and AFM phases. This result provides a promising platform for realizing time-reversal breaking correlated topological phases, such as fractional Chern insulator and p+ip topological superconductor. In addition, our calculation indicates that the twisted stacking facilitates the emergence of quantum anomalous Hall effect in MnBi2Te4.

Original languageEnglish (US)
Article number126402
JournalPhysical review letters
Volume124
Issue number12
DOIs
StatePublished - Mar 27 2020

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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