Hydrostatic pressure and electric field effect on electronic states in double quantum rings

Abstract

Using the effective mass approximation and the transfer matrix formalism, we have calculated the ground state energy of electron in 0.7 0.3 GaAs/Ga_0.7Al_0.3As concentric double quantum rings under the combined effects of electric field and hydrostatic pressure. The ground state energy dependences on the electric field, hydrostatic pressure and width of outer ring are reported for different values of the thickness of rings. We have found that for low pressure regime (less than P = 8.37 kbar ) the ground state energy decreases slower than for high pressure regime (higher then P = 8.37 kbar ). Additionally, we have found that the effect of hydrostatic pressure on ground state energy mainly depends on the electric field strength and the sizes of quantum ring.