Zero-Hall-resistance state in a semimetallic InAs/GaSb superlattice

We observe giant oscillations in the Hall resistivity of a semimetallic superlattice of InAs/GaSb, with almost equal electron and hole densities. A thermally activated zero is observed in the Hall resistivity when the Fermi energy lies within the localized states for electrons and holes with the same Landau index. This is interpreted as the balancing of the electron and hole contributions, and depends critically on the limiting behavior of the conductivity components as they approach quantized values.