Linear and nonlinear optical properties of CdSe/ZnTe core/shell nanostructures with screened modified Kratzer potential

Abstract

In this work, we have theoretically examined the linear, nonlinear and total refractive index changes (RICs) and optical absorption coefficients (OACs) between the ground (1s) and the first excited state (1p) of CdSe/ZnTe core/shell quantum dot (CSQD) with Screened Modified Kratzer potential (SMKP): V(r)=De(q−re*e^(−αr)/r)^2 where re is the equilibrium bond length. To achieve this goal, the wave functions and the corresponding eigenvalues of the electron are investigated by resolving the timeindependent Schrödinger equation using diagonalization technique in terms of the effective mass approximation. The dependency of energy difference between the 1s and 1p states and dipole transition matrix element on the SMKP parameters are examined. The numerical results exhibit that the characteristic parameters of SMKP (α, qandre) and incident optical intensity (I) have a strong impact on RICs and OACs. It was obtained that the resonance peak positions of the OACs and RICs are redshifted (blue shifted) with increasing the re (α and q parameters). Furthermore, to get a great variation of the RICs and OACs, a relatively feebler I should be adopted. The model potential used in the computation is important, and study of it will be practical in the development and research of nanostructures systems.