TY - JOUR T1 - Giant nonlinearity in zero-gap semiconductor superlattices JF - Physical Review B Y1 - 2014 A1 - Silveirinha, Mário G. A1 - Engheta, Nader VL - 89 UR - http://link.aps.org/doi/10.1103/PhysRevB.89.085205 IS - 8 JO - Phys. Rev. B ER -