102 citations · 370 across the 9 of their papers we have counts for
6 papers · 1 filter
Excitonic exchange effects on the radiative decay time of monoexcitons and biexcitons in quantum dots
Gustavo A. Narvaez, Gabriel Bester, Alberto Franceschetti +1
Electron-hole exchange interactions split the exciton ground state into "dark" and "bright" states. The dynamics of those states depends on the internal relaxation time between bri…
Screening of point charges in Si quantum dots
Alberto Franceschetti, M. Claudia Troparevsky
The screening of point charges in hydrogenated Si quantum dots ranging in diameter from 10 A to 26 A has been studied using first-principles density-functional methods. We find tha…
Excited-state relaxations and Franck-Condon shift in Si quantum dots
A. Franceschetti, S. T. Pantelides
Excited-state relaxations in molecules are responsible for a red shift of the absorption peak with respect to the emission peak (Franck-Condon shift). The magnitude of this shift i…
Multi-excitons in self-assembled InAs/GaAs quantum dots: A pseudopotential, many-body approach
A. J. Williamson, A. Franceschetti, A. Zunger
We use a many-body, atomistic empirical pseudopotential approach to predict the multi-exciton emission spectrum of a lens shaped InAs/GaAs self-assembled quantum dot. We discuss th…
Addition spectra of quantum dots: The role of dielectric mismatch
Alberto Franceschetti, Andrew Williamson, Alex Zunger
Using atomistic pseudopotential wave functions we calculate the electron and hole charging energies of InAs quantum dots. We find that the charging energies depend strongly on the…
Comment on "Quantum Confinement and Optical Gaps in Si Nanocrystals"
Alberto Franceschetti, Lin-Wang Wang, Alex Zunger
We show that the method used by Ogut, Chelikowsky and Louie (Phys. Rev. Lett. 79, 1770 (1997)) to calculate the optical gap of Si nanocrystals omits an electron-hole polarization e…