INTEGRO-DIFFERENCE EQUATION FOR A CORRELATION-FUNCTION OF THE SPIN-1/2 HEISENBERG XXZ CHAIN
NUCLEAR PHYSICS B 446:3 (1995) 448-460
SYMMETRIES OF STRONGLY CORRELATED ELECTRONS
HUBBARD MODEL: ITS PHYSICS AND MATHEMATICAL PHYSICS 343 (1995) 71-80
Symmetries of strongly correlated electrons
TOPOLOGICAL METHODS IN DIFFERENTIAL EQUATIONS AND INCLUSIONS 472 (1995) 71-80
SU(2) × SU(2)-invariant scattering matrix of the Hubbard model
Nuclear Physics, Section B 426:3 (1994) 505-533
Abstract:
We consider the one-dimensional half-filled Hubbard model. We show that the excitation spectrum is given by the scattering states of four elementary excitations, which form the fundamental representation of SU(2) × SU(2). We determine the exact two-particle scattering matrix, which is a solution of the Yang-Baxter equation and reflects the SO(4) symmetry of the model. The results for the repulsive and attractive Hubbard model are related by an interchange of spin and charge degrees of freedom. © 1994.Exactly Solvable Models of Strongly Correlated Electrons
, 1994