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Article Dans Une Revue Physical Review Letters Année : 2004

Effect of quantum confinement on the dielectric constant of PbSe

Résumé

Monolayers of lead selenide nanocrystals of a few nanometers in height have been made by electrodeposition on a Au(111) substrate. These layers show a thickness-dependent dielectric function, which was determined using spectroscopic ellipsometry. The experimental results are compared with electronic structure calculations of the imaginary part of the dielectric function of PbSe nanocrystals. We demonstrate that the size-dependent variation of the dielectric function is affected by quantum confinement at well-identifiable points in the Brillouin zone, different from the position of the band-gap transition

Dates et versions

hal-00141244 , version 1 (12-04-2007)

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Zeger Hens, Daniel Vanmaekelbergh, Ernst Stefan Kooij, Herbert Wormeester, Guy Allan, et al.. Effect of quantum confinement on the dielectric constant of PbSe. Physical Review Letters, 2004, 92, pp.026808/1-4. ⟨10.1103/PhysRevLett.92.026808⟩. ⟨hal-00141244⟩
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