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

 

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Opened Access Pygmy resonances in artificial nuclei far-infrared absorption by electron-hole droplets
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Author: Capote, Roberto
Delgado, Alain
González, Augusto
Department: Universidad de Sevilla. Departamento de Física Atómica, Molecular y Nuclear
Date: 2001-01-30
Published in: Modern Physics Letters B, 15 (2), 81-87.
Document type: Article
Abstract: The structure of E1 resonances has been examined in a microscopic random phase approximation calculation for neutral, symmetric, closed shell and electron-hole systems in a quantum dot. The number of electron-hole pairs, N, is varied from 6 to 42. The occurrence of small, but distinct, E1 peaks in the far-infrared spectra located in the low energy tail of the giant dipole resonance consisting of highly coherent electron-hole excitations is predicted. These pygmy resonances account for about 2% of the dipole energy-weighted photoabsorption sum rule. A very weak dependence of the average pygmy resonance energy on the number of electron-hole pairs is found.
Cite: Capote, R., Delgado, A. y González, A. (2001). Pygmy resonances in artificial nuclei far-infrared absorption by electron-hole droplets. Modern Physics Letters B, 15 (2), 81-87.
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URI: http://hdl.handle.net/11441/64230

DOI: 10.1142/S0217984901001549

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