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Study of the ground-state electronic spin-polarization can permit discoveryand identification of novel correlated phases in the quantum Hall (QH) system.It can thus determine the potential usefulness of QH states for quantumcomputing. However, prior measurements involving optical and NMR techniques mayperturb the system away from delicate ground-states. Here, we presentspin-resolved pulsed tunneling (SRPT) that precisely determines the completephase diagram of the ground-state spin-polarization as a function of magneticfield (B) and filling factor ({\nu}). We observe fully-polarized {\nu} = 5/2and 8/3 states at very small B, suggesting strong deviation from theweakly-interacting composite-fermion model that largely successfully describesour phase diagram for the lowest Landau level. The results establish SRPT as apowerful technique for investigating correlated electron phenomena.

Complete spin phase diagram of the fractional quantum Hall liquid