The breakdown of the metallic Fermi-liquid paradigm in strongly interacting electron systems produces numerous exotic correlated states of matter. In this presentation, I will introduce ultra-high mobility ZnO-based heterostructures as a new vehicle to access the strongly correlated transport regime of two-dimensional electron systems. In addition to robust quantum Hall features, the fingerprints of strong correlations may be tracked as interactions are amplified in field-effect transistor devices. These include a sharp enhancement of the spin susceptibility of carriers, a metal-insulator transition in the longitudinal resistance, and non-linear current-voltage characteristics indicative of a pinned Wigner solid at ultra-low temperature (T<10mK). Given the tunability of correlation strength and simplicity of the heterostructure design, the material lends itself to studying the elusive nature of two-dimensional electrons when the Coulomb interaction dominates their kinetic energy.
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