Dynamical exchange-correlation potential formalism for spin- 12 Heisenberg and Hubbard chains : The antiferromagnetic/half-filled case
The exchange-correlation potential formalism previously introduced and applied to the one-dimensional Hubbard model has been extended to spin systems and applied to the case of the one-dimensional antiferromagnetic spin-12 Heisenberg model. Within the spin exchange-correlation potential formulation, a sum rule for spin systems is derived. The exchange-correlation potential for the Heisenberg model