Emergence of Chern Insulating States in Non-Magic Angle Twisted Bilayer Graphene

Twisting two layers into a magic angle (MA) of ~1.1{\deg} is found essential to create low energy flat bands and the resulting correlated insulating, superconducting, magnetic phases in twisted bilayer graphene (TBG). While most previous works focus on revealing these emergent states MA-TBG, study twist dependence, which helps map an evolution phases, yet less explored. Here, we report magneto-transport one non-magic TBG device, whose {\theta} changes from 1.25{\deg} at end 1.43{\deg} other. For {\theta}=1.25{\deg}, observe emergence topological insulating hole side with sequence Chern number |C|=4-|v|, where v electrons (holes) moir\'e unite cell. When {\theta}>1.25{\deg}, insulator band disappears evolves fractal Hofstadter butterfly quantum Hall flux cell matters. Our observations will stimulate further theoretical experimental investigations relationship between electron interactions non-trivial topology.