  We investigate magnetoresistance of a square array of superconducting islands
placed on a normal metal, which offers a unique tunable laboratory for
realizing and exploring quantum many-body systems and their dynamics. A vortex
Mott insulator where magnetic field-induced vortices are frozen in the dimples
of the egg crate potential by their strong repulsion interaction is discovered.
We find an insulator-to-metal transition driven by the applied electric current
and determine critical exponents that exhibit striking similarity with the
common thermodynamic liquid-gas transition. A simple and straightforward
quantum mechanical picture is proposed that describes both tunneling dynamics
in the deep insulating state and the observed scaling behavior in the vicinity
of the critical point. Our findings offer a comprehensive description of
dynamic Mott critical behavior and establish a deep connection between
equilibrium and nonequilibrium phase transitions.
