7 articles
Haldane phase
The Haldane phase is a gapped phase of one-dimensional integer-spin antiferromagnetic chains with hidden topological order and edge states, the first symmetry-protected topological phase discovered.
Heisenberg model
The Heisenberg model is a lattice model of magnetism in which localized quantum spins on atomic sites interact through exchange, introduced by Werner Heisenberg in 1928 to explain ferromagnetism.
Ising model
The Ising model, also known as the Ising spin model, is a mathematical model of spins on a lattice and the simplest model with a phase transition.
Kitaev quantum spin liquid
The Kitaev quantum spin liquid, or Kitaev spin liquid, is the quantum spin liquid ground state of the exactly solvable Kitaev model on a honeycomb lattice, proposed by Alexei Kitaev in 2006.
Random-field Ising model
The random-field Ising model is a lattice spin model in which ferromagnetic Ising spins couple to frozen random fields, introduced by Imry and Ma in 1975 and central to disordered systems.
Shastry-Sutherland model
The Shastry-Sutherland model, introduced by B. Sriram Shastry and Bruce Sutherland in 1981, is a 2D antiferromagnet on a square lattice with an exact ground state.
XY model
The XY model is a lattice spin model of planar rotators with nearest-neighbor cosine coupling, the paradigmatic example of the vortex-driven BKT transition in two dimensions.