Quantum Anomalous Hall Crystal at Fractional Filling of Moiré Superlattices
D. N. Sheng, Aidan P. Reddy, Ahmed Abouelkomsan, Emil J. Bergholtz, Liang Fu
Abstract
We predict the emergence of a state of matter with intertwined ferromagnetism, charge order, and topology in fractionally filled moiré superlattice bands. Remarkably, these quantum anomalous Hall crystals exhibit a quantized integer Hall conductance that is different than expected from the filling and Chern number of the band. Microscopic calculations show that this phase is robustly favored at half-filling (ν=1/2) at larger twist angles of the twisted semiconductor bilayer tMoTe_{2}.
Topics & Concepts
SuperlatticeQuantum Hall effectFractional quantum Hall effectMoiré patternCondensed matter physicsPhysicsCrystal (programming language)Materials scienceQuantum mechanicsQuantum spin Hall effectOpticsElectronComputer scienceProgramming languageQuantum and electron transport phenomenaMagnetic Field Sensors Techniques