Intersubband optical absorption in Gaussian GaAs quantum dot in the presence of magnetic, electrical and AB flux fields

We theoretically study the spectral properties of single electron two-dimensional (2D) Gaussian quantum dot (GQD) in the presence of applied magnetic, electrical field and along with an Aharonov–Bohm (AB) flux field. We have calculated the exact solutions for the normalized wave functions and energy levels by using the Nikiforov–Uvarov (NU) method within the effective-mass approximation and compared the results with parabolic potential (PP) model. Based on the calculated energy spectrum and the wave function, we have obtained the intersubband light absorption coefficient (K(ϖ)) and the value of absorption threshold frequency (ϖ). The main and important object of the present work is to study the effect of the GQD size (R) and the strength of the potential (V0) on the energetic spectrum and the absorption threshold frequency (ϖ). According to the present work results, the ground state (GS) energy and the (ϖ) shows that the size of the QD, depth of the potential and electric field plays an important role

Effect of spin-orbit interactions on the energy, magnetic moment and susceptibility of an off-center donor impurity in a Gaussian quantum dot

The Rashba and Dresselhaus spin-orbit interactions and magnetic field effect on an off-center neutrally charged hydrogenic donor impurity D0 in a three-dimensional (3D) GaAs Gaussian quantum dot is investigated in the framework of effective-mass approximation theory. By performing a unitary transformation the effect of the spin-orbit interactions (αR,αD) The Rayleigh-Ritz variational method is employed for the resulting Hamiltonian with a simple wave function to determine the ground state (GS) energy, GS magnetic moment, and GS magnetic susceptibility of an off-centre hydrogenic donor impurity. The results show that the Rashba spin-orbit interaction reduces, the Dresselhaus spin-orbit interaction and magnetic field enhances the total GS energy of the donor impurity. © 2020 Author(s)