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The time evolution of a particle, caught in an infinitely deep square well,displays unexpected features, when one includes tiny relativistic effects.Indeed, even the smallest corrections to the non-relativistic quadraticspectrum manifest themselves in a dramatic way. Our theoretical analysis bringsto light a completely new time scale, at which the system exhibits surprisinglyperfect revivals. This longer time scale rules the system dynamics and replacesthe original revival time of the unperturbed system. The early manifestation ofsuch phenomenon is captured by the sensitivity of sub-Planck structures fordifferent values of the relativistic corrections.

Super revivals and sub-Planck scale structures of a slightly relativistic particle in a box