Interaction-Driven Topological Phase Diagram of Twisted Bilayer MoTe2

Twisted bilayer MoTe2 is a promising platform to investigate the interplay between band topology and many-body interactions. We present a theoretical study of its interaction-driven quantum phase diagrams based on a three-orbital model, which can be viewed as a generalization of the Kane-Mele-Hubbard model with one additional orbital and long-range Coulomb repulsion. We predict a cascade of phase transitions tuned by the twist angle 0. At the hole-filling factor v = 1 (one hole per moire ' unit cell), the ground state can be in the multiferroic phase, with coexisting spontaneous layer polarization and magnetism; the quantum anomalous Hall phase; and finally, the topologically trivial magnetic phases, as 0 increases from 1.5 degrees to 5 degrees. At v = 2, the ground state can have a second-order phase transition between an antiferromagnetic phase and the quantum spin Hall phase as 0 passes through a critical value. The dependence of the phase boundaries on model parameters, such as the gate-to-sample distance, the dielectric constant, and the moire ' potential amplitude, is examined. The predicted phase diagrams can guide the search for topological phases in twisted transition metal dichalcogenide homobilayers.

Automated summary

Twisted bilayer MoTe2 is studied theoretically to predict its interaction-driven quantum phase diagrams and examine the dependence of phase boundaries on model parameters. These results provide guidance for the search for topological phases in twisted transition metal dichalcogenide homobilayers.