EXACT DIAGONAL CALCULATIONS OF COULOMB OSCILLATIONS IN QUANTUM DOTS

Transport properties through a quantum dot are examined based on exact diagonal calculations of many-body states, when the Coulomb interacti on energy is comparable with one-ell,ctron level spacings. The peak po sitions of Coulomb oscillation show an atomic-like shell structure of one-electron levels, in agreement with recent experimental results. So me peaks of tile conductance increase in height with increasing temper ature. This anomalous temperature dependence reflects a level spacing as small as 1K and total spin of the ground state. The transport prope rties through coupled two dots are also investigated. We show that the correlation effect influences the peak heights of the conductance. Th ese phenomena exemplify the observation of many-body wavefunctions in quantum dots. by the Coulomb oscillation.