Mixed optical phonon modes in semiconductor nanocrystals synthesized in porous ...

• Autor(es): Belogorokhov, Alexander ; Belogorokhova, Lyuba ; Miranda, R. P. ; Vasilevskiy, Mikhail ; Gavrilov, S. A.
• Data: 2004
• Identificador Persistente: http://hdl.handle.net/1822/5467
• Origem: RepositóriUM - Universidade do Minho
• Assunto(s): Quantum dot; Quantum wire; Phonons; Effective dielectric function; FIR spectroscopy
• Tipo de Documento: Artigo
• Idioma: Inglês

Descrição

This work is devoted to experimental and theoretical studies of optical phonons confined in CdS nanocrystals grown inside a porous alumina matrix. The complete sets of phonon modes, confined in a spherical quantum dot and in a cylindrical quantum wire, are considered in the framework of a continuum model, which allows the mixing of all the expected types of vibrations. It is shown that the calculated phonon-related response in the far-infrared spectral region agrees qualitatively with the measured spectra of typical samples, providing an explanation for a rather unusual structure of the reflection and transmission spectra.