Excitonic effects in the optical properties of CdSe nanowires

Details Excitonic effects in the optical properties of CdSe nanowires Excitonic effects in the optical properties of CdSe nanowires

2010-02-08

arxiv.org/abs/1002.1562v1

Appl. Phys. Lett. 96, 123106 (2010)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

submitted

Scientific paper

10.1063/1.3368126

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 nano-scale 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 that describes 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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