Link between cascade phenomenon and correlated Chern insulators in magic-angle twisted bilayer graphene.

ABSTRACT: Chern insulators are topologically non-trivial states of matter characterized by incompressible bulk and chiral edge states. Incorporating topological Chern bands with strong electronic correlations provides a versatile playground for studying emergent quantum phenomena. In this study, we resolve the correlated Chern insulators (CCIs) satisfying | ν | +|C | = 4 in magic-angle twisted bilayer graphene (MATBG) through Rydberg exciton sensing and unveil their direct link with the zero-field cascade features in the electronic compressibility. The compressibility minima in the cascade are found to deviate substantially from nearby integer fillings (by Δν) and coincide with the onsets of CCIs in doping densities, yielding a quasi-universal relation B_c = Φ₀Δν/C (onset magnet

SUBMITTER: Hu Q 

PROVIDER: S-EPMC12569382 | biostudies-literature | 2025 Oct

REPOSITORIES: biostudies-literature