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Multiband models with hot spots are of current interest partly because oftheir relevance for the iron-based superconductors. In these materials, themomentum-dependent scattering off spin fluctuations and the ellipticity of theelectron Fermi pockets are responsible for anisotropy of the lifetimes ofexcitations around the Fermi surface. The deep minima of the lifetimes---theso-called hot spots---have been assumed to contribute little to the transportas is indeed predicted by a simple relaxation-time approach. Calculatingforward-scattering corrections to this approximation, we find that theeffective transport times are much more isotropic than the lifetimes and that,therefore, the hot spots contribute to the transport even in the case of strongspin-fluctuation scattering. We discuss this effect on the basis of ananalytical solution of the Boltzmann equation and calculate numerically thetemperature and doping dependence of the resistivity and the Hall, Seebeck, andNernst coefficients.

Transport in multiband systems with hot spots on the Fermi surface: Forward-scattering corrections