Many-body wave function and collective dynamics of electrons in artificial atoms

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Artificial atoms or quantum dots, novel quantum systems confining a small number of electrons in a low-dimensional artificially-designed nanoscale potential well, play an essential role in the development of next generation devices operating under the principle of quantum mechanics, utilized in, such as, quantum computation and quantum telecommunication. Since the electronic properties of artificial atoms are known to depend strongly on their size and/or number of electrons, understanding their complicated electronic structure is one of the most fundamental and essential issues. In this direction the present study has focused on the origin of so-called Hund's rule and on the appearance of angular correlation in artificial atoms. An inherent hole in the spin-parallel singlet wave function has been identified and is called conjugate Fermi hole. It has been shown that the origin of Hund's rule and angular correlation can be rationalized on the basis of this conjugate-Fermi-hole concept.