Exact & non-interacting

Tight binding

Diagonalising the non-interacting lattice in momentum space — bands, Fermi surfaces, density of states.

Every topic that uses this method, drawn from across all subjects.

• The Hubbard Model Mott Physics in Correlated Lattices The minimal model of reference for the cuprates — one hopping amplitude and one on-site repulsion — together with its particle–hole symmetry, Green's functions, and the two limits (atomic and non-interacting) that already reveal the Mott insulator.