Singlet-Triplet Transitions of a Pöschl-Teller Quantum Dot

We study the energy spectra of a two-dimensional two-electron quantum dot(QD) with Pöschl-Teller confining potential under the influence ofperpendicular homogeneous magnetic field. Calculations are made by using the method of numerical diagonalization of Hamiltonian matrix within theeffective-mass approximation. A ground-state behavior (spin singlet-triplettransitions) as a function of the strength of a magnetic field isfound. We find that the dot radius R of a Pöschl-Teller potential isimportant for the ground-state transition and the feature of ground-state for a Pöschl-Teller QD and a parabolic QD is similar when R is larger. The larger the well depth, the higher the magnetic field for thesinglet-triplet transition of the ground-state of two interacting electrons in a Pöschl-Teller QD.