Non-Local Thirring Model with different left and right Fermi Velocities

V. FERNÁNDEZ; C NAÓN

Caxambu

Encuentro; XVIII Encontro Nacional de Fisica de Particulas e Campos; 1997

Sociedade Brasileira de Fisica

Recently, there has been much interest in the study of low-dimensional field theories. This is due, in part, to amazing achievements in the material sciences that led to the fabrication of one- dimensional semiconductors. One important tool for the theoretical description of these systems is the Tomonaga-Luttinger model, which has been recently formulated as a 1 + 1 non-local Quantum Field Theory [ C. Naón, C. von Reichenbach and M. Trobo, Nuclear Physics B 435 [FS] (1995) 567]. In this work we extend this formulation to the case in which left and right moving particles have different velocities. In particular, we obtain an effective action describing the dynamics of the collective excitations for this system and compute the corresponding dispersion relations for these charge-density and spin-density waves.