Autler-Townes splitting and quantum confined Stark effect of sideband peak in asymmetric double quantum wells

Optical absorption is investigated by self-consistent density matrix approach in asymmetric double quantum wells driven by an intense terahertz field and a direct current electric field polarized along the growth direction. Rich nonlinear dynamic behaviors of sideband absorption peaks are systematically studied in undoped asymmetric double quantum wells. When only in presence of a resonant terahertz field, the Autler-Townes splitting of the sideband peaks becomes pronounced with increasing the strength of the terahertz field. Quantum confined Stark effect of sideband peaks is discussed when an invariant terahertz field and a direct current electric field are simultaneously applied to the quantum well. It is shown that the sideband peaks of the 1s main absorption peak undergo a red-shift and the sideband peaks of the 2s main absorption peak undergo a blue-shift with increasing intensity of the direct current electric field. The presented results have potential applications in electro-optical devices.