DefinePK

Abstract

A novel platform for researching topological quantum phenomena, unusual superconductivity, and strongly coupled electron physics is Twisted Bilayer Graphene (TBG) at the “Magic Angle” (~1.05°). Two graphene layers are rotated to this exact angle to form a moiré superlattice, which produces flat electronic bands that significantly improve electron-electron interactions. This results in a rich phase diagram with non-Fermi liquid behaviour, correlated insulators, and superconductivity. This review covers the theoretical foundations, experimental results, and unanswered concerns about magic-angle TBG, including significant challenges like twist angle control, disorder effects, and the interaction of strain and electrical characteristics. Beyond basic research, TBG has great technological potential, with potential applications in neuromorphic devices, ultra-sensitive sensors, and quantum computing (e.g., topological qubits). This system provides a novel approach to comprehending high-temperature superconductivity and achieving next-generation quantum technologies by fusing insights from correlated physics with device engineering.