Spin waves in La2CuO4: band structure and correlation effects

We calculate the antiferromagnetic spin wave dispersion in the half-filled (electronic density n = 1) Hubbard model for a two-dimensional square lattice, using the random phase approximation (RPA) in a broken symmetry (spin density wave) ground state. Our results for the spin wave dispersion, ω (q), are compared with high-resolution inelastic neutron scattering performed on La2CuO4. The effects of different band structures and different values of the on-site Coulomb interaction on the spin wave spectrum are studied. Particular attention is put on the high energy dispersion values ω (π/2, π/2) and ω (0, π).