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Conference Papers Year : 2000

Excitonic and quasiparticle gaps in Si nanocrystals


We present calculations of the one- and two-particle excitations in silicon nanocrystals. The one-particle properties are handled in the GW approximation, and the excitonic gap is obtained from the Bethe-Salpeter equation. We develop a tight binding version of these methods to treat clusters up to 275 atoms. The self-energy and Coulomb corrections almost exactly cancel each other for crystallites with radius larger than 0.6 nm. The result of this cancellation is that one-particle calculations give quite accurate values for the excitonic gap of crystallites in the most studied range of sizes.
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hal-00158952 , version 1 (02-07-2007)



Christophe Delerue, Michel Lannoo, Guy Allan. Excitonic and quasiparticle gaps in Si nanocrystals. CECAM Workshop on Excited States and Electronic Spectra, 2000, Lyon, France. ⟨10.1103/PhysRevLett.84.2457⟩. ⟨hal-00158952⟩
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