Magnetic moment and susceptibility of an impurity in a parabolic quantum dot

Abstract

Abstract We study the problem of an electron, neutrally charged donor impurity ( D 0 ) and acceptor impurity in a two-dimensional (2D) semiconductor quantum dot (SQD) with parabolic potential in the presence of an external magnetic field within the effective-mass approximation by using the numerical matrix diagonalization method. The energy spectrum is calculated for an electron, donor impurity and acceptor impurity as a function of the magnetic field. We find the ground state (GS) magnetic moment ( μ gs ) and the GS magnetic susceptibility ( χ gs ) of an acceptor impurity system, It only shows zero temperature diamagnetic peaks, but an electron and the donor impurity does not. The position and the number of these zero temperature diamagnetic peaks depend on the strength of the confinement potential ( ω 0 ) . The binding energies of the few low-lying states are also obtained by directly calculating the energies of an electron and donor impurity and it shows that the donor impurity is stable in a parabolic quantum dot (PQD). The theory is applied to a GaAs PQD.