We report a combined theoretical and experimental investigation of quantum confinement effects on the E-1 interband structures in the optical spectra of Ge quantum dots. The experimental average radius goes from approximate to 12 to approximate to 60 Angstrom. A blueshift of the E-1 absorption peak (up to 0.1 eV) and a strong reduction in the oscillator strength, are measured effects of the quantum confinement. The theoretical analysis is performed for nanocrystals up to 15 Angstrom through a semi-empirical tight-binding approach. We overcome the single-particle scheme including, in a perturbative approach. the Coulomb electron-hole interaction which induces a red-shift of the E-1 peak with respect to the one-electron calculation.
Optical properties of germanium quantum dots / M. Palummo, G. Onida, R. Del Sole, A. Stella, P. Tognini, P. Cheyssac, R. Kofman. - In: PHYSICA STATUS SOLIDI B-BASIC RESEARCH. - ISSN 0370-1972. - 224:1(2001), pp. 247-251.
Titolo: | Optical properties of germanium quantum dots |
Autori: | ONIDA, GIOVANNI (Secondo) |
Settore Scientifico Disciplinare: | Settore FIS/03 - Fisica della Materia |
Data di pubblicazione: | 2001 |
Rivista: | |
Tipologia: | Article (author) |
Digital Object Identifier (DOI): | http://dx.doi.org/10.1002/1521-3951(200103)224:1<247::AID-PSSB247>3.0.CO;2-O |
Appare nelle tipologie: | 01 - Articolo su periodico |