Tunable correlated phases in ultra-high mobility oxides

Clean two-dimensional electron systems have been intensively studied due to the astounding array of correlated electronic phases they elicit. In this presentation, I will introduce ZnO-based heterostructures as a new strongly interacting oxide platform for studying the transport of ultra-high mobility carriers. In a magnetic field, we observe a delicate competition between gapped incompressible, compressible and anisotropic nematic phases which may be tuned between by modifying the spin polarization of carriers. In the absence of a magnetic field, dilute samples display a metal-insulator transition as the strength of interactions is increased. Concomitantly, the signatures of a divergent spin susceptibility and spontaneous spin polarization are resolved, suggesting the realization of the elusive Stoner ferromagnet transition in a two-dimensional metal.