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The structure of E1 resonances is examined in a microscopic random phaseapproximation calculation for neutral, symmetric, closed shell, electron-holesystems in a quantum dot. The number of electron-hole pairs, N, is varied from6 to 42. The ocurrence of small, but distinct, E1 peaks in the far infraredspectra located in the low energy tail of the giant dipole resonance andconsisting of highly coherent electron-hole excitations is predicted. Thesepigmy resonances account for about 2 % of the dipole energy-weightedphotoabsorption sum rule. A very weak dependence of the average pigmy resonanceenergy on the number of electron-hole pairs is found.Comment: LaTeX, 4 pages, 2 figures, submitted to Phys.Rev.

PYGMY RESONANCES IN ARTIFICIAL NUCLEI: FAR-INFRARED ABSORPTION BY ELECTRON–HOLE DROPLETS