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We analyze the local level occupation of a spinless, interacting two-levelquantum dot coupled to two leads by means of Wilson's numerical renormalizationgroup method. A gate voltage sweep, causing a rearrangement of the charge suchthat the system's energy is minimized, leads to oscillations, and sometimeseven inversions, in the level occupations. These charge oscillations can beunderstood qualitatively by a simple Hartree analysis. By allowing a relativesign in one tunneling matrix element between dot and leads, we extend ourfindings to more generic models.Comment: 6 pages, 7 figure

Charge oscillations in quantum dots: Renormalization group and Hartree method calculations