Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Flat Chern Band From Twisted Bilayer MnBi$_2$Te$_4$   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. In addition, our calculation indicates that
the twisted stacking facilitates the emergence of quantum anomalous Hall effect
in MnBi$_2$Te$_4$.

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The categories of this paper are: eess
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The categories of this paper are: hep-lat
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The categories of this paper are: quant-ph
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The categories of this paper are: cmp-lg
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The categories of this paper are: chem-ph
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The categories of this paper are: atom-ph
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The categories of this paper are: adap-org
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The categories of this paper are: math
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The categories of this paper are: patt-sol
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The categories of this paper are: hep-ex
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The categories of this paper are: chao-dyn
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The categories of this paper are: hep-ph
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The categories of this paper are: math-ph
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The categories of this paper are: gr-qc
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The categories of this paper are: stat
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The categories of this paper are: cs