Valentin Didier Crepel, Center for Computational Quantum Physics, Flatiron Institute

In this talk, I will highlight the robust Ising ferromagnetism driven by Coulomb interaction that we expect to appear in the metallic phase of twisted transition metal dichalcogenides homobilayers at small twist angles. This spin polarized phase, a half-metal, has a spin gap and exhibits anomalous Hall effect. It serves as a pre-requisite to more fragile correlated phase at fractional filling and lower temperatures, such as a spin polarized fractional Chern insulator that we identify in a small portion of the phase diagram of the system. 

Our works suggests that the numerous (fully or partially) flavor polarized correlated states predicted in moire heterostructures near zero-temperature ​might be efficiently located by first looking for half-metallic behaviors at higher temperatures.