Occurrence of multiphoton resonances in five-level systems by large-amplitude driving fields

Abstract

The multiphoton resonances are investigated in a five-level system in which two states are coupled strongly with two large-amplitude symmetric driving fields and both are periodically swept via other levels with the energy splitting E. Near the resonance condition in which the interdot charge transitions take place, the asymmetry at odd or even multiples of photon is found, being in agreement with experimental observations in GaAs and InAs double quantum dots. We calculate the transition rates with resonant traits through making all the energy levels time-dependent. Interestingly, the different behavior of resonances remains deep in the strong dephasing regime on the two driven energy levels. Because of the interaction between two fields such resonances take place at the third order of the energy level couplings for the first time and for higher orders as well. We investigate the strong detuning dependence of current steady-state and its complete agreement with the experiments based on calculating current in the spin blockade region via modeling the energy level structure double quantum dots and using numerical simulations. Finally, it is shown that the obtained results have all main features of the experimental data.