Exact solution of the Landau fixed point via bosonization

Abstract

We study, via bosonization, the Landau fixed point for the problem of interacting spinless fermions near the Fermi surface in dimensions higher than one. We rederive the bosonic representation of the Fermi operator and use it to find the general form of the fermion propagator for the Landau fixed point. Using a generalized Bogoliubov transformation we diagonalize exactly the bosonized hamiltonian for the fixed point and calculate the Fermion propagator (and the quasiparticle residue) for isotropic interactions (independently of their strength). We reexamine two well known problems in this context: the screening of long range potentials and the Landau damping of gauge fields. We also discuss the origin of the Luttinger fixed point in one dimension in contrast with the Landau fixed point in higher dimensions.