Rabi-vibronic resonance with large number of vibrational quanta

Abstract

We study theoretically the Rabi oscillations of a resonantly driven two-level system linearly coupled to a harmonic oscillator (vibrational mode) with frequency, ω_0. We show that for weak coupling, ω_p \ll ω_0, where ω_p is the polaronic shift, Rabi oscillations are strongly modified in the vicinity of the Rabi-vibronic resonance Ω_R = ω_0, where Ω_R is the Rabi frequency. The width of the resonance is (Ω_R-ω_0) \sim ω_p^{2/3} ω_0^{1/3} \gg ω_p. Within this domain of Ω_R the actual frequency of the Rabi oscillations exhibits a bistable behavior as a function of Ω_R. Importantly, within the resonant domain, the oscillator is highly excited, which allows to treat it classically.

9 pages, 5 figures

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