Extended Quantum Anomalous Hall States in Graphene/Hexagonal Boron Nitride Moiré Superlattices Academic Background In recent years, the behavior of electrons in topological flat bands has attracted widespread attention in the field of condensed matter physics. Electrons in topological flat bands can form new topological states driven by strong corr...

Academic Background and Problem Statement In metrology, the quantum Hall effect (QHE) and the Josephson effect respectively provide quantum standards for electrical resistance (ohm) and voltage (volt). However, conventional quantum Hall resistance standards (QHRs) rely on strong external magnetic fields (typically requiring superconducting magnets ...