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A vortex in a Bose-Einstein condensate on a ring undergoes quantum dynamicsin response to a quantum quench in terms of partial symmetry breaking from auniform lattice to a biperiodic one. Neither the current, a macroscopicmeasure, nor fidelity, a microscopic measure, exhibit critical behavior.Instead, the symmetry memory succeeds in identifying the point at which thesystem begins to forget its initial symmetry state. We further identify asymmetry energy difference in the low lying excited states which trends withthe symmetry memory.

Nonequilibrium quantum dynamics of partial symmetry breaking for ultracold bosons in an optical lattice ring trap