Fermi liquid behavior of metallic 2D holes at high temperatures

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The resistivity ρ of high mobility dilute 2D holes in GaAs exhibits a peak at a certain temperature T* in zero magnetic field(B=0). In the T>T* regime where dρ/dT<0, we observe for the first time both the ν=1 quantum Hall(QH) effect and a low field insulator-QH transition which is consistent with the 2D hole system being a Fermi liquid(FL). The known linear T-dependent conductivity in this T regime then can be explained by hole-hole Coulomb interactions of this FL. The fact that the system is metallic (dρ/dT>0) for T<T* implies that the high temperature FL transforms into the 2D metallic state in the neighborhood of T*.