Simultaneous effects of optical intensity and magnetic field on optical properties of GaN/AlN multi-wells quantum rings with constant outer radius

< p>Here, we study the effect of the optical intensity, external magnetic field, well number and quantum ring thicknesses on the optical absorption of AlN/GaN constant radius multi-wells quantum rings. We show that when the intensity increases, the total absorption coefficient reduces. This fact is independent of the inner quantum ring radius Rin, magnetic field, and number of wells. The total absorption coefficient reduces monotonically when the number of wells increases. However, the system with Rin=400 Å at zero magnetic field is an exception. In this system, if the number of wells increases, the total absorption coefficient firstly decreases and then increases. By increasing Rin, the total absorption coefficient monotonically reduces. This monotonic decreasing behavior exists for systems with more number of wells and higher magnetic fields. At fixed Rin and for systems with greater number of wells and higher values Rin, the total absorption coefficient monotonically decreases when the magnetic field increases. Finally, at lower magnetic fields, the total absorption coefficient decreases more rapidly than in higher magnetic fields.