Moiré fractional Chern insulators. I. First-principles calculations and continuum models of twisted bilayer 
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Jia, Yujin; Yu, Jiabin; Liu, Jiaxuan; Herzog-Arbeitman, Jonah; Qi, Ziyue; Pi, Hanqi; Regnault, Nicolas; Weng, Hongming; Bernevig, B. Andrei; Wu, Quansheng

doi:10.1103/physrevb.109.205121

Phys. Rev. B

2024

DOI: 10.1103/physrevb.109.205121

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Moiré fractional Chern insulators. I. First-principles calculations and continuum models of twisted bilayer MoTe2

Yujin Jia,

Jiabin Yu,

Jiaxuan Liu

et al.

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Cited by 20 publications

References 81 publications

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Polarization-driven band topology evolution in twisted MoTe2 and WSe2

Zhang,

Wang,

Liu

et al. 2024

Nat Commun

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Motivated by recent experimental observations of opposite Chern numbers in R-type twisted MoTe2 and WSe2 homobilayers, we perform large-scale density-functional-theory calculations with machine learning force fields to investigate moiré band topology across a range of twist angles in both materials. We find that the Chern numbers of the moiré frontier bands change sign as a function of twist angle, and this change is driven by the competition between moiré ferroelectricity and piezoelectricity. Our large-scale calculations, enabled by machine learning methods, reveal crucial insights into interactions across different scales in twisted bilayer systems. The interplay between atomic-level relaxation effects and moiré-scale electrostatic potential variation opens new avenues for the design of intertwined topological and correlated states, including the possibility of mimicking higher Landau level physics in the absence of magnetic field.

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Polarization-driven band topology evolution in twisted MoTe2 and WSe2

Zhang,

Wang,

Liu

et al. 2024

Nat Commun

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Trion sensing of a zero-field composite Fermi liquid

Anderson,

Cai,

Reddy

et al. 2024

Nature

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Direct magnetic imaging of fractional Chern insulators in twisted MoTe2

Redekop,

Zhang,

Park

et al. 2024

Nature

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Moiré fractional Chern insulators. I. First-principles calculations and continuum models of twisted bilayer MoTe2

Cited by 20 publications

References 81 publications

Polarization-driven band topology evolution in twisted MoTe2 and WSe2

Polarization-driven band topology evolution in twisted MoTe2 and WSe2

Trion sensing of a zero-field composite Fermi liquid

Direct magnetic imaging of fractional Chern insulators in twisted MoTe2

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