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Electronic states in silicon quantum dots are examined theoretically, takinginto account a multivalley structure of the conduction band. We find that (i)exchange interaction hardly works between electrons in different valleys. Inconsequence electrons occupy the lowest level in different valleys in theabsence of Hund's coupling when the dot size is less than 10 nm. High-spinstates are easily realized by applying a small magnetic field. (ii) When thedot size is much larger, the electron-electron interaction becomes relevant indetermining the electronic states. Electrons are accommodated in a valley,making the highest spin, to gain the exchange energy. (iii) In the presence ofintervalley scattering, degenerate levels in different valleys are split. Thiscould result in low-spin states. These spin states in multivalley artificialatoms can be observed by looking at the magnetic-field dependence of peakpositions in the Coulomb oscillation.Comment: 18 pages, 5 figure

Electronic states in silicon quantum dots: Multivalley artificial atoms