Excitonic properties in an asymmetric quantum dot nanostructure under combined influence of temperature and lateral hydrostatic pressure

摘要： Simultaneous influences of temperature and lateral hydrostatic pressure combined to axial asymmetric confinement potential and size effects on the behavior of the exciton in 0D (cid:1833)(cid:1853)(cid:1827)(cid:1871)/(cid:1833)(cid:1853)((cid:2869)(cid:2879)(cid:3051)(cid:3285))Al((cid:2934)(cid:3168)) asymmetric cylindrical quantum dot (QD) nanostructure are investigated. Our calculations are performed in the framework of the effective mass approximation by using a variational method with a robust trial wave function through taking into account the dependence of exciton properties on the QD sizes, the axial asymmetric confinement potential, the temperature and the pressure. Variation of the excitonic binding energy, photoluminescence energy transition and band gap energy are discussed according to temperature and hydrostatic pressure for different confinement regimes and various potential wells. Our numerical findings show that the applied pressure favors the attraction between electron and hole while the temperature tends to decrease the exciton binding energy. Furthermore, the photoluminescence energy is decreasing function of the temperature and increasing function of the pressure. The opposing influences caused by temperature and lateral hydrostatic pressure with contribution of variation of axial asymmetric confinement potential reveal a significant practical interest and offer an alternative manner to the tuning of the excitonic transition in optoelectronic devices.