Abstract
We present ground- and excited-state energies obtained from diffusion Monte Carlo (DMC) calculations, using accurate multiconfiguration wave functions, for N electrons confined to a circular quantum dot. We compare the density and correlation energies to the predictions of local spin density approximation (LSDA) theory and Hartree-Fock (HF) theory, and analyze the electron-electron pair-correlation functions. The DMC estimated change in electrochemical potential as a function of the number of electrons in the dot is compared to that from LSDA and HF calculations. Hund’s first rule is found to be satisfied for all dots except for which there is a near degeneracy.
- Received 14 March 2000
DOI:https://doi.org/10.1103/PhysRevB.62.8120
©2000 American Physical Society