Non-Local Thirring Model including backward and Umklapp scattering processes for 1d spinless fermions

V. FERNÁNDEZ; C IUCCI; C NAÓN

Sao Lourenco

Encuentro; XXII Encontro Nacional de Fisica de Particulas e Campos; 2001

Sociedade Brasileira de Fisica

We study a (1+1)-dimensional fermionic quantum field theory with nonlocal couplings between currents. This model describes an ensemble of spinless fermions interacting through forward, backward and Umklapp scattering processes. We obtain a bosonized expression for the partition function, describing the dynamics of the collective modes of this system, it can be observed the appearance of a gap on the charge excitations due to the Umklapp scattering process.