Speaker
Description
Two-dimensional semiconductor moiré superlattices provide a highly tunable platform for exploring emergent quantum states arising from the interplay of strong correlations and topology. In this talk, I will present our recent work on twisted trilayer MoTe2. By fabricating devices that incorporate both A-A bilayer and A-AB trilayer regions, and by combining low-temperature transport, magnetic circular dichroism spectroscopy, and theoretical calculations, we find that the additional B layer of MoTe2 can substantially reconstruct the correlated ground state. The composite Fermi liquid and fractional quantum anomalous Hall states observed in the A-A region evolve in the A-AB region into putative topological electron crystal states exhibiting integer-quantized Hall responses. Theory shows that the B layer has only a limited effect on the bandwidth, but strongly reshapes the distributions of Berry curvature and quantum metric, thereby driving the competition between CFL/FQAH states and topological electron crystals. These results establish remote-layer engineering as a promising route for controlling quantum geometry and provide a new experimental platform for investigating novel topological electron crystals.