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arXiv:1601.00734 · Annals of Physics

Resonance fluorescence of strongly driven two-level system coupled to multiple dissipative reservoirs

Yiying Yan, Zhiguo Lü, Hang Zheng

Published Apr 13, 2016• 8 citations
arXivHTMLPDF
DOI
10.1016/j.aop.2016.04.006

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The recently developed technique combining the weak-coupling limit with the Floquet formalism is applied to a model of a two-level atom driven by a strong laser field and weakly coupled to heat baths. First, the case of a single electromagnetic bath at zero temperature is discussed and the formula for resonance fluorescence is derived. The expression describes the well-known Mollow triplet, but its details differ from the standard ones based on additional simplifying assumptions. The second example describes the case of two thermal reservoirs: an electromagnetic one at finite temperature and the second dephasing one, which can be realized as a phononic or buffer gas reservoir. It is shown using the developed thermodynamical approach that the latter system can work in two regimes depending on the detuning sign: a heat pump transporting heat from the dephasing reservoir to an electromagnetic bath or heating both, always at the expense of work supplied by the laser field.
In this work we study the effect of thermal fluctuations in the resonance fluorescence of a two-level system. The damped two-level system is driven by a strong incident classical field near resonance frequency. To simulate the thermal bath we introduce a large system of harmonic oscillators that represent the normal modes of the thermal radiation field. To obtain the time development of the fluorescent light intensity we solve the Heisenberg equations of motion transformed in a system of coupled integral equations by an iterative method. The results show that the presence of the bath modifies dramatically the time development of the fluorescence light intensity when compared with the case T=0 K.