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Raman analysis of embedded monolayers and quantum dots
Author(s) -
Geurts J.,
Wagner V.
Publication year - 2005
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.200541152
Subject(s) - monolayer , quantum dot , raman spectroscopy , ternary operation , ab initio , spectral line , vibration , materials science , molecular vibration , spectroscopy , molecular physics , chemistry , condensed matter physics , nanotechnology , physics , optics , quantum mechanics , organic chemistry , computer science , programming language
We demonstrate the potential of resonant Raman spectroscopy from vibration modes for the analysis of embedded monolayers and quantum dots. As representative systems, we present results for CdSe, embedded either in BeTe or in ZnSe. The vibration spectra reflect a distinctly different behaviour. For CdSe in BeTe, they reveal atomically sharp interfaces, especially when the interface bonds are chosen to be Cd–Te. In addition, the vibration modes reflect the onset of quantum dot formation. They are described by ab initio calculations. In contrast, in case of CdSe quantum dots in ZnSe, the vibration spectra are explained in terms of ternary (Cd,Zn)Se modes with increasing Cd content for increasing nominal CdSe coverage. Thus, they reveal a noticeable interfacial intermixing on the scale of a few monolayers. (© 2005 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)