%0 Journal Article
%T Spin waves in La_2CuO_4: band structure and correlation effects
%A N. M. R. Peres
%A M. A. N. Araujo
%J Statistics
%D 2003
%I arXiv
%R 10.1002/pssb.200301719
%X 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, \omega(\vec q), are compared with high-resolution inelastic neutron scattering performed on La_2CuO$_4. The effects of different band structures and different values of the on-site Coulomb interaction on the spin wave spectrum is studied. Particular attention is put on the high energy dispersion values \omega(\pi/2,\pi/2) and \omega(0,\pi).
%U http://arxiv.org/abs/cond-mat/0303409v1