Abstract
Transient dynamics of a biased two-level system with Ohmic dissipation driven by a high-frequency laser field is studied within the noninteracting-blip approximation. It is found that in the low temperature limit, if the friction parameter a is between 1/2 and 1, the rate constant for the tunneling of a system particle will increase with the intensity and frequency of the field, and the lower frequencies will be in favor of localization of the particle in the metastable state. For 0 < α < 1/2, quantum coherence is observed, and the transition temperature from the coherent to incoherent motion is found to depend on the field intensity. When the laser field intensity parameter approaches the zeros of the Nth Bessel function, the coherence disappears. This transition from coherent to incoherent motion oscillating with the intensity of the field gives rise to a cascade of transitions at different temperatures.
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