  The use of intense tailored light fields is the perfect tool to achieve
ultrafast control of electronic properties in quantum materials. Among them,
Mott insulators are materials in which strong electron-electron interactions
drive the material into an insulating phase. When shinning a Mott insulator
with a strong laser pulse, the electric field may induce the creation of
doublon-hole pairs, triggering an insulator-to-metal phase transition. In this
work, we take advantage of the threshold character of this insulator-to-metal
transition and we propose a pump-probe scheme that consists of a mid-infrared
laser pulse and a train of short pulses separated by half-period of the
mid-infrared with alternating phases. By varying the time-delay between the two
pulses and the internal carrier envelope phase of the short pulses, we achieve
control of the phase transition, which leaves its fingerprint at its high
harmonic spectrum.
