Electron correlations, spontaneous magnetization and momentum density in quantum dots
arXiv:cond-mat/0405564 · doi:10.1016/j.jpcs.2004.08.012
Abstract
The magnetization of quantum dots is discussed in terms of a relatively simple but exactly solvable model Hamiltonian. The model predicts oscillations in spin polarization as a function of dot radius for a fixed electron density. These oscillations in magnetization are shown to yield distinct signature in the momentum density of the electron gas, suggesting the usefulness of momentum resolved spectroscopies for investigating the magnetization of dot systems. We also present variational quantum Monte Carlo calculations on a square dot containing 12 electrons in order to gain insight into correlation effects on the interactions between like and unlike spins in a quantum dot.
6 pages, 4 figures
References in corpus (6)
- Density dependent spin polarisation in ultra low-disorder quantum wires
- Diameter dependence of ferromagnetic spin moment in Au nanocrystals
- Electronic structure of rectangular quantum dots
- Suppression of Ground-State Magnetization in Finite-Sized Systems Due to Off-Diagonal Interaction Fluctuations
- Spin and Conductance-Peak-Spacing Distributions in Large Quantum Dots: A Density Functional Theory Study
- Spontaneous Magnetization and Electron Momentum Density in 3D Quantum Dots