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We calculate the Hall transport in a multiband systems with a dominantinterband interaction between carriers having electron and hole character. Weshow that this situation gives rise to an unconventional scenario, beyond theBoltzmann theory, where the quasiparticle currents dressed by vertexcorrections acquire the character of the majority carriers. This leads to alarger (positive or negative) Hall coefficient than what expected on the basisof the carrier balance, with a marked temperature dependence. Our resultsexplain the puzzling measurements in pnictides and they provide a more generalframework for transport properties in multiband materials.

Unconventional Hall effect in pnictides from interband interactions