Theoretical investigation of terahertz optical sidebands in a single quantum dot

We present a theoretical investigation on the dynamics of excitons, excitonic distribution functions, and absorption spectra of a single quantum dot driven by terahertz electric fields using the femtosecond laser pulse. In particular, we observe optical sidebands at frequencies of 2n ωL away from the exciton resonance due to coherent quantum superposition of Floquet states induced by the terahertz field. These frequency-doubled sidebands can occur at twice the frequency typically observed in bulk, quantum well, and superlattice structures. We have also obtained the oscillating excitonic densities for Floquet states as a function of the terahertz field strengths.