Observation of Reentrant quantum anomalous Hall effect in twisted MoTe2

The emergence of topological moiré flat bands provides exciting opportunities to explore a variety of many-body electronic liquid and solid phases without the need for an external magnetic field. In this talk, we present the observation on the reentrant quantum anomalous Hall effect, the zero magnetic field analogue of reentrant quantum Hall effect, in twisted bilayer MoTe2 moiré system. In particular, we observed reentrant integer quantum anomalous Hall (RIQAH) states in between of ν = 2/3 and 3/5 (ν is the moiré hole filling factor) fractional quantum anomalous Hall (FQAH) states. Notably, for the RIQAH states, although Hall conductance shows a clear integer quantized plateau of e2/h, the measured Streda dispersion does not correspond to C = 1. Our work paves the way for further investigation of subtle competitions between fractional Chern insulators, superconductivity, reentrant quantum anomalous Hall solids, and other interaction-driven quantum states in semiconductor moiré systems.