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Excitonic systems localized in a single InAs/GaAs parabolic quantum dot arestudied theoretically using an unrestricted Hartree-Fock method. The bindingenergies of excitons, conventional biexcitons and quadrons - four particlessystem of two electrons and two holes, in the ground state have been obtainedas functions of magnetic field and confinement potential. It is found that forstrong confinement, while the binding energy of biexciton is negative, thebinding energy of quadron is positive, suggesting the strong lateralconfinement of the parabolic quantum dot supports the formation of a quadronrather than a biexciton.

Strongly confined 2D parabolic quantum dot: Biexciton or Quadron?