XY model

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The XY model, also known as the O(2) model because of its symmetry group, is a Heisenberg ferromagnetic with an easy-plane anisotropy. The Hamiltonian is given by

in other words

where the sum runs over all pairs of nearest neighbour spins, , and where is the coupling constant.

Random field XY model (RFXY)[edit]

XY universality class[edit]

(see: XY universality class)

See also[edit]


Related reading