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Linear temperature dependence of conductivity in the "insulating" regime of dilute two-dimensional holes in GaAs

Lilly, Michael L.; Simmons, J.A.

The conductivity of extremely high mobility dilute two-dimensional holes in GaAs changes linearly with temperature in the insulating side of the metal-insulator transition. Hopping conduction, characterized by an exponentially decreasing conductivity with decreasing temperature, is not observed when the conductivity is smaller than e{sup 2}/h. We suggest that strong interactions in a regime close to the Wigner crystallization must be playing a role in the unusual transport.