Above the band gap structures in Ge nanoparticles: optical-absorption spectra

Autor:	P. Tognini, A. Stella, M. Geddo, P. Cheyssac, Richard Kofman, Lucio Claudio Andreani
Rok vydání:	1996
Předmět:	Brillouin zone Range (particle radiation) Materials science Band gap Quantum dot Oscillator strength General Physics and Astronomy Nanoparticle Radius Atomic physics Absorption (electromagnetic radiation)
Zdroj:	Il Nuovo Cimento D. 18:865-872
ISSN:	1826-9893 0392-6737
DOI:	10.1007/bf02457319
Popis:	We report absorption measurements on Ge nanoparticles in the range 0.6–6 eV. By reducing the dot average radius to about 13 A, one observes a relevant blue-shift of theE1+Δ1 andE2 peaks and a change of the oscillator strength of the two main structures. Simulations using effective-medium theories have been carried out and the embedding matrix contribution to the measured properties has been evaluated. The different behaviour of the absorption peaksE1,E1+Δ1 andE2 under quantum confinement has been related to their specific nature within the whole Brillouin zone.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::79124c5c7e67c9b9bf22723a72875130 https://doi.org/10.1007/bf02457319 Zobrazit plný text záznamu Full text from SpringerLink