Evolution of the Bilayer ν=1 Quantum Hall State Under Charge Imbalance

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We use high-mobility bilayer hole systems with negligible tunneling to examine how the bilayer ν=1 quantum Hall state evolves as charge is transferred from one layer to the other at constant total density. We map bilayer ν=1 state stability versus imbalance for five total densities spanning the range from strongly interlayer coherent to incoherent. We observe competition between single-layer correlations and interlayer coherence. Most significantly, we find that bilayer systems that are incoherent at balance can develop spontaneous interlayer coherence with imbalance, in agreement with recent theoretical predictions.