Density of states in 3D interacting metals: ballistic effects
Interaction-induced correction to the density of states in three-dimensional disordered metal is studied beyond the diffusive regime. For quasiparticles energies greater than the inverse scattering rate the correction appears to have a linear singularity and is strongly asymmetric with respect to particle-hole symmetry with the prevalent contribution for excitations beyond the Fermi level in the case of the parabolic dispersion. This prediction is stable with respect to introducing unharmonicity.