Flat Chern Band from Twisted Bilayer MnBi2Te4

Biao Lian; Zhaochen Liu; Yuanbo Zhang; Jing Wang

doi:10.1103/PhysRevLett.124.126402

Flat Chern Band from Twisted Bilayer MnBi2Te4

Biao Lian, Zhaochen Liu, Yuanbo Zhang, Jing Wang

Physics

Research output: Contribution to journal › Article › peer-review

56 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 language	English (US)
Article number	126402
Journal	Physical review letters
Volume	124
Issue number	12
DOIs	https://doi.org/10.1103/PhysRevLett.124.126402
State	Published - Mar 27 2020

All Science Journal Classification (ASJC) codes

General Physics and Astronomy

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10.1103/PhysRevLett.124.126402

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abstract = "We construct a continuum model for the moir{\'e} 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.",

author = "Biao Lian and Zhaochen Liu and Yuanbo Zhang and Jing Wang",

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AU - Lian, Biao

AU - Liu, Zhaochen

AU - Zhang, Yuanbo

AU - Wang, Jing

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N2 - 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.

AB - 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.

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Flat Chern Band from Twisted Bilayer MnBi2Te4

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