Pigmy resonances in artificial nuclei: far-infrared absorption by electron-hole droplets

Details Pigmy resonances in artificial nuclei: far-infrared absorption by electron-hole droplets Pigmy resonances in artificial nuclei: far-infrared absorption by electron-hole droplets

2001-01-11

arxiv.org/abs/cond-mat/0101173v1

Mod.Phys.Lett. B15 (2001) 81

Physics

Condensed Matter

Strongly Correlated Electrons

LaTeX, 4 pages, 2 figures, submitted to Phys.Rev.A

Scientific paper

10.1142/S0217984901001549

The structure of E1 resonances is examined in a microscopic random phase approximation calculation for neutral, symmetric, closed shell, electron-hole systems in a quantum dot. The number of electron-hole pairs, N, is varied from 6 to 42. The ocurrence of small, but distinct, E1 peaks in the far infrared spectra located in the low energy tail of the giant dipole resonance and consisting of highly coherent electron-hole excitations is predicted. These pigmy resonances account for about 2 % of the dipole energy-weighted photoabsorption sum rule. A very weak dependence of the average pigmy resonance energy on the number of electron-hole pairs is found.

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