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Excitonic Theory of the Ultrafast Optical Response of 2D-Quantum-Confined Semiconductors at Elevated Densities
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DOI：10.1002/qute.70271.png)
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Abstract
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An excitonic approach to the ultrafast optical response of confined semiconductors at elevated densities below the Mott transition is presented. The theory is valid from the coherent regime, where coherent excitonic transitions and biexcitons dominate, to the incoherent regime, where excitonic occupations dominate. Numerical simulations of the 1 s $1s$ exciton dynamics during intense circularly polarized pump pulses in two different Coulomb-interaction regimes are performed for 2D semiconductors: Moderate Coulomb interaction is compared with dominating Coulomb interaction with respect to the light–matter interaction strength. The different many-body contributions are disentangled and it is found that excitonic Rabi oscillations in the Coulomb-dominated regime are considerably less strong. By also comparing circular and linear excitation in a MoSe 2 ${\rm MoSe}_2$ monolayer, it is found that linear excitation creates a regime where excitonic Rabi oscillations are almost completely suppressed.
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