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We explore non-analytic quantum phase dynamics of dipolar exciton condensatesformed in a system of 1D quantum layers subjected to voltage quenches. We mapthe exciton condensate physics on to the pseudospin ferromagnet model showingan additional oscillatory metastable and paramagnetic phase beyond thewell-known ferromagnetic phase by utilizing a time-dependent, non-perturbativetheoretical model. We explain the coherent phase of the exciton condensate inquantum Hall bilayers, observed for currents equal to and slightly larger thanthe critical current, as a stable time-dependent phase characterized bypersistent charged meron flow in each of the individual layers with acharacteristic AC Josephson frequency. As the magnitude of the voltage quenchis further increased, we find that the time-dependent current oscillationsassociated with the charged meron flow decay, resulting in a transientpseudospin paramagnet phase characterized by partially coherent charge transferbetween layers, before the state relaxes to incoherent charge transfer betweenthe layers.

Voltage Induced Dynamical Quantum Phase Transitions in Exciton Condensates