2 papers
cond-mat2002
Thermodynamics of the one-dimensional s=1 XXZ Heisenberg model: analytical results
O. Rojas, E. V. Correa-Silva, W. A. Moura-Melo +2
We apply the results recently derived by Rojas et al. to derive the beta-expansion of the Helmholtz free energy of the spin-1 XXZ Heisenberg model up to 5th order in beta. The anal…
cond-mat1996
Dynamics of the Two-Site Hubbard Model
A. T. Costa, M. T. Thomaz
The dynamical evolution of a two-site Hubbard model is derived in the presence of an uniform external magnetic field for a general initial state. The time evolution of the half-fil…