ZERO-HALL-RESISTANCE STATE IN A SEMIMETALLIC INAS GASB SUPERLATTICE/

We observe giant oscillations in the Hall resistivity of a semimetalli c superlattice of InAs/GaSb, with almost equal electron and hole densi ties. A thermally activated zero is observed in the Hall resistivity w hen the Fermi energy lies within the localized states for electrons an d holes with the same Landau index. This is interpreted as the balanci ng of the electron and hole contributions, and depends critically on t he limiting behavior of the conductivity components as they approach q uantized values.