Electric- and magnetic-field-tuned Landau levels and Hall conductivity in AA-stacked bilayer graphene

► We study Landau levels and Hall conductivity in a biased AA-bilayer graphene. ► Criterions for determining zero Landau level and level crossings are derived. ► The Hall conductivities are dependent on the combined values of the applied fields. ► Zero-conductance Hall plateaus can vanish at the specific combinations of the fields. ► Some resonance Hall conductivity steps can also occur.