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2019

Flat Chern Band From Twisted Bilayer MnBi$_2$Te$_4$

Lian, Biao, Liu, Zhaochen, Zhang, Yuanbo et al.

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We construct a continuum model for the Moir\'e superlattice of twisted bilayer MnBi$_2$Te$_4$, 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 $1^\circ$ turns the highest valence band into a flat band with Chern number $\pm1$ 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.

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