The Fractional Quantum Anomalous Hall Effect in Twisted MoTe2

Abstract

Emergent quantum phenomena in two-dimensional moire superlattices, particularly twisted bilayerMoTe2 (tMoTe2), reveals a rich interplay between electronic correlations and band topology. Leveraging device fabrication, optical spectroscopy, local imaging techniques, and low-temperature electrical transport measurements, we have experimentally demonstrated robust integer and fractional quantum anomalous Hall (QAH) states without external magnetic fields. Fractionally quantized Hall conductance plateaus at fillings such as ν = −2/3 and −3/5, accompanied by vanishing longitudinal resistance, provide definitive evidence for fractional Chern insulating (FCI) phases driven purely by electron-electron interactions. Additionally, local visualization of fractional edge states through microwave impedance microscopy has directly confirmed bulk-edge correspondence. Further exploration into higher Chern bands and dissipationless transport has expanded understanding of correlation-driven phenomena, uncovering potential pathways to non-Abelian fractional states relevant for quantum computing. These results collectively establish twisted MoTe2 as an exceptional platform for exploring novel quantum states and highlight their potential for future topological quantum technologies.