Effect of Magnetic Field on the Energy Spectrum, Binding Energy and Magnetic Susceptibility of an Impurity in a 2D Gaussian Quantum Dot

The problem of on-center acceptor A 0 and donor D 0 impurities in a two-dimensional (2D) GaAs quantum dot in the presence of an externally applied magnetic field now modelled with Gaussian confinement and examined with the exact matrix diagonalization technic. Magnetic moment, susceptibilities are calculated after obtaining the energy spectrum of these impurities. I have compared the results of these impurities with parabolic confinement. I found an interesting phenomenon in the attendance of spin-Zeeman term, the ground state magnetic (GSM) moment M g s and the GSM susceptibility S g s of one electron system, donor D 0 and acceptor A 0 impurity systems demonstrate zero-temperature diamagnetic spikes owing to transitions in the orbital angular momentum (OAM). The number of spikes and the position of these spikes depend on the radius of the quantum dot and depth of the potential V 0 also. The low-lying binding energy levels have been studied by computing state away from the energies of donor D 0 impurity and an electron.