Abstract
We present a first-principles study of the correlated electron-hole states in a silicon nanowire of a diameter of and their influence on the optical absorption spectrum. The quasiparticle states are calculated employing a many-body Green’s function approach within the GW approximation to the electron self-energy, and the effects of the electron-hole interaction to optical excitations are evaluated by solving the Bethe-Salpeter equation. The enhanced Coulomb interaction in this confined geometry results in an unusually large binding energy for the excitons, which dominate the optical absorption spectrum.
- Received 8 August 2006
DOI:https://doi.org/10.1103/PhysRevB.75.201304
©2007 American Physical Society