Abstract
We study the lifetime of localized states in a two-level system coupled to a dissipative bath and driven by strong time-periodic monochromatic fields. At high temperature, moderate friction and high frequency driving the dynamics is practically exponential characterized by a rate constant. By mapping the driven dissipative two-level system onto a dissipative multilevel curve-crossing problem and applying semiclassical nonadiabatic rate theory we show that strong fields can stabilize localized states over long time intervals and that the delocalization rate exhibits a ``universal'' plateau whose value depends only on the intensity of the driving field. Numerical path integral results confirm our theoretical predictions.
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