Pressure-dependent of linear and nonlinear optical properties of (In,Ga)N/GaN spherical QD

•The absorption coefficients are dramatically affected by the pressure effect.•A significant blue-shift of all ACs is observed.•Two competing parameters are suggested to explain our results.•The maximum of the amplitude of optical ACs decreases nonlinearly under pressure effect.

Third-order nonlinear intra-conduction band optical properties of (In,Ga)N–GaN spherical quantum dot are investigated. Linear, third-order nonlinear and total absorption coefficients (ACs) of 1p–1d and 1d–1f transitions are computed using a combination of Quantum Genetic Algorithm (QGA) and Hartree–Fock–Roothaan (HFR) method. Hydrostatic pressure effect is examined within the single band effective-mass and the one parabolic band approximations under finite potential barrier. The results show that the hydrostatic pressure has a great impact on the optical properties of QDs. A blue shift of the resonant peak is observed while the maximum of the amplitude of optical absorption coefficients decreases nonlinearly under hydrostatic pressure effect. Two competing parameters are suggested to explain our results. Compared with the finding results, a good agreement is shown.