Incommensurate spin-density wave in two-dimensional Hubbard model
  We consider the magnetic phase diagram of the two-dimensional Hubbard model on a square lattice. We take into account both spiral and collinear incommensurate magnetic states. The possibility of phase separation of spiral magnetic phases is taken into consideration as well. Our study shows that all the listed phases appear to be the ground state at certain parameters of the model. Relation of the obtained results to real materials, e.g. Cu-based high-temperature superconductors, is discussed. 
M.A. Timirgazin, A.K. Arzhnikov, A.V. Vedyayev
cond-mat.str-el