Spin waves in La_2CuO_4: band structure and correlation effects

Details Spin waves in La_2CuO_4: band structure and correlation effects Spin waves in La_2CuO_4: band structure and correlation effects

2003-03-20

arxiv.org/abs/cond-mat/0303409v1

Phys. Stat. Sol. 236, 523 (2003)

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, 2 figures

Scientific paper

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).

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