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Excitonic effects in the optical properties of CdSe nanowires

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  • Excitonic effects in the optical properties of CdSe nanowires
Author
José Vilhena
Silvana Botti
M Marques
Keywords
paper
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.

Year of Publication
2010
Journal
Appl. Phys. Lett.
Volume
96, 123106
URL
http://apl.aip.org/applab/v96/i12/p123106_s1
DOI
10.1063/1.3368126
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