The singlet-triplet transition of two interacting electrons in a Frost-Musulin quantum dot

In the paper, the electronic properties of a quantum dot (QD) using the Frost-Musulin potential model are investigated taking into account both an external magnetic field and electron-electron interaction. For this purpose, the Schrodinger equation (SE) is analytically solved without considering electron-electron interaction by employing the Nikiforov-Uvarov (NU) procedure, and the energy levels and wave functions are determined. Then, the singlet-triplet (ST) transition is studied for different values of magnetic fields. According to our results, Both the dot size and magnetic field have key roles in the ground state transition. The ST transition of the ground state moves to lower magnetic fields as the QD size is increased. However the transition occurs at higher magnetic fields when the potential depth is increased. The transition for small QD size occurs only from 1S to 3P. But by increasing the QD size, another transition is also observed from 1D to 3F. These transitions occur at smaller magnetic fields when the QD size is increased.