Excitonic effects in the optical properties of CdSe nanowires

TitleExcitonic effects in the optical properties of CdSe nanowires
Publication TypePalaiseau Article
Acknowledgements

ETSF-I3, IDRIS

DOI10.1063/1.3368126
Vilhena, JG, Botti, S, Marques, M
Year of Publication2010
JournalAppl. Phys. Lett.
Volume96, 123106
URLhttp://apl.aip.org/applab/v96/i12/p123106_s1
Keywordspaper
Abstract

Using a first-principle approach beyond density functional theory we calculate the electronic and optical properties of small diameter CdSe nanowires. Our results demonstrate how some approximations commonly used in bulk systems fail at this nanoscale level and how indispensable it is to include crystal local fields and excitonic effects to predict the unique optical properties of nanowires. From our results, we then construct a simple model to describe the optical gap as a function of the diameter of the wire, that turns out to be in excellent agreement with experiments for intermediate and large diameters.

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