Quantum theory Anisotropy Bilayer Graphene Charge density Charge density waves Chern numbers Dirac fermions Excitons Fermion models Finite temperatures Fixed points Graphene Graphene lattices Intelligent systems Lattice models Modeling features Monte Carlo methods Mott insulators Nematics Optical conductivity Ordered phasis Phase diagrams Phase transitions Quantum criticality Quantum-phase transition Real-space Rotational symmetries Statistical mechanics Symmetry breakings Time reversal symmetries