Microwave control of transport through a chaotic mesoscopic dot

We establish analogy between a microwave ionization of Rydbergatoms and a charge transport through a chaotic quantum dotinduced by a monochromatic field in a regime with a potentialbarrier between dot contacts. We show that the quantum coherence leads to dynamical localizationof electron excitation in energyso that only a finite number of photons is absorbed inside the dot.The theory developed determines the dependence of localization lengthon dot and microwave parameters showing that the microwave powercan switch the dot between metallic and insulating regimes. ultiphoton ionization and excitation to highly excited states (e.g., Rydberg states)