Abstract
We present a density-functional theory (DFT) approach to the study of the phase diagram of the maximum-density droplet (MDD) in two-dimensional quantum dots in a magnetic field. Within the lowest Landau level (LLL) approximation, analytical expressions are derived for the values of the parameters (number of electrons) and (magnetic field) at which the transition from the MDD to a “reconstructed” phase takes place. The results are then compared with those of full Kohn-Sham calculations, giving thus information about both correlation and Landau level mixing effects. Our results are also contrasted with those of Hartree-Fock (HF) calculations, showing that DFT predicts a phase diagram, which is in better agreement with the experimental results and the result of exact diagonalizations in the LLL than the HF calculations.
- Received 25 February 1997
DOI:https://doi.org/10.1103/PhysRevB.56.12108
©1997 American Physical Society