Many-body effects on the low-lying energy levels of three-electron quantumdots in a magnetic field

The low-lying energy levels of three-electron quantum dots in a magnetic fi eld are calculated by both the Hartree-Fock (HF) and the numerical diagonal ization methods. Many-body effects on the energy level structure are invest igated by comparing the results from these two approaches. It is found that many-body interactions can apparently change the relative positions of the low-lying energy levels, especially at larger angular momentum quantum num bers, and the relative changes of the levels almost have nothing to do with the external magnetic held, but linearly depend on the dot size.