Higher Landau-Level Analogs and Signatures of Non-Abelian States in Twisted Bilayer MoTe_{2}.

Phys Rev Lett

University of Washington, Department of Materials Science and Engineering, Seattle, Washington 98195, USA.

Published: February 2025

AI Article Synopsis

  • Recent discoveries of fractional Chern insulators in moiré superlattices, particularly in twisted MoTe_{2} bilayers, reveal three consecutive flat Chern bands at specific twist angles (around 2°) that relate to Landau level physics.
  • The study identifies four consecutive C=1 bands in the K valley at twist angles of 2.00° and 1.89°, employing a six-orbital model constructed from density functional theory (DFT) to describe the Chern bands.
  • The research also highlights potential non-Abelian states when the second moiré miniband is half-filled, suggesting implications for fault-tolerant quantum information processing using non-Abelian anyons at zero magnetic field.

Article Abstract

Recent experimental discovery of fractional Chern insulators at zero magnetic field in moiré superlattices has sparked intense interests in bringing Landau level physics to flat Chern bands. In twisted MoTe_{2} bilayers (tMoTe_{2}), recent theoretical and experimental studies have found three consecutive flat Chern bands at twist angle ∼2°. In this Letter, we investigate whether higher Landau level physics can be found in these consecutive Chern bands. At twist angles 2.00° and 1.89°, we identify four consecutive C=1 bands for the K valley in tMoTe_{2}. By constructing Wannier functions directly from density functional theory (DFT) calculations, a six-orbital model is developed to describe the consecutive Chern bands, with the orbitals forming a honeycomb lattice. Exact diagonalization on top of Hartree-Fock calculations are carried out with the Wannier functions. Especially, when the second moiré miniband is half-filled, signatures of non-Abelian states are found. Our Wannier-based approach in modeling moiré superlattices is faithful to DFT wave functions and can serve as benchmarks for continuum models. The possibility of realizing non-Abelian anyons at zero magnetic field also opens up a new pathway for fault-tolerant quantum information processing.

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http://dx.doi.org/10.1103/PhysRevLett.134.076503DOI Listing

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  • The research also highlights potential non-Abelian states when the second moiré miniband is half-filled, suggesting implications for fault-tolerant quantum information processing using non-Abelian anyons at zero magnetic field.
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