CHARGE EXCITATIONS OF QUANTUM DOTS IN MAGNETIC-FIELDS

We study the low-lying charge excitations in quantum dots under the pr esence of magnetic fields such that the filling factor is 1. We show t hat they are magnetoexcitons and provide a novel set of operators that describe them. The accuracy of this description is shown by the high overlap of the magnetoexciton wave functions with the exact eigenstate s of a quantum dot in a magnetic field obtained from numerical calcula tions up to 20 electrons. This allows us to compute, in this regime, t he total energies and spectral functions in quantum dots for an arbitr arily large number of electrons.