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A new reentrant insulating phase (RIP) in low magnetic fields has beenreported in the literature in strongly interacting 2D carrier systems and wassuggested to be related to the formation of a Wigner crystal [e.g. Qiu et al,PRL 108, 106404 (2012)]. We have studied the transformation between themetallic liquid phase and the low field RIP in a dilute 2D hole system withlarge interaction parameter $r_s$ (~20-30) in GaAs quantum wells. Instead of asharp transition, increasing density (or lowering $r_s$) drives the RIP into astate where an incipient RIP coexists with the metallic 2D hole liquid. Thenon-trivial temperature dependent resistivity and the in-plane magnetic fieldinduced enhancement of the RIP highlight the competition between two phases andthe essential role of spin in this mixture phase, and are consistent with thePomeranchuk effect in a mixture of Wigner crystal and Fermi liquid.

Incipient Formation of the Reentrant Insulating Phase in a Dilute 2D Hole System with Strong Interactions