Nonlocal Thirring model with spin-flipping interactions

ANÍBAL IUCCI; KANG LI; CARLOS M. NAÓN

NUCLEAR PHYSICS B

Elsevier

Año: 2001 vol. 601 p. 607 - 619

0550-3213

We extend a non local and non covariant version of the Thirring model in order to describe a many-body system with spin-flipping interactions By introducing a model with two fermion species we are able to avoid the use of non abelian bosonization which is needed in a previous approach. We obtain a bosonized expression for the partition function, describing the dynamics of the collective modes of this system. By using the self-consistent harmonic approximation we found a formula for the gap of the spin-charge excitations as functional of arbitrary electron-electron potentials.