Floquet states in a single quantum dot driven by THz fields

We present quasi-energies and Floquet states of excitons driven by terahertz (THz) electric fields in a single quantum dot using the Floquet theory. The eigenvalues are significantly coupled to truncated states, which correspond to the number of photons in the THz field. In particular, we find that for N = 20 photons the energy difference between quasi-energy ladders remains almost constant up to strengths of the THz fields with f < 16 in a single quantum dot. The photon representation is needed with the larger number to accurately describe the single quantum dot system as the intensity of the THz field is increased.