6533b7d1fe1ef96bd125d744
RESEARCH PRODUCT
Correlation energy of two-dimensional systems: Toward non-empirical and universal modeling
Esa RäsänenEsa RäsänenStefano PittalisE. K. U. GrossCesar Ramon Proettosubject
PhysicsStrongly Correlated Electrons (cond-mat.str-el)FOS: Physical sciencesCondensed Matter PhysicsElectron localization functionElectronic Optical and Magnetic MaterialsMagnetic fieldCondensed Matter - Strongly Correlated ElectronsQuantum dotQuantum mechanicsDensity functional theoryFermi gasGround stateEnergy (signal processing)Spin-½description
The capability of density-functional theory to deal with the ground-state of strongly correlated low-dimensional systems, such as semiconductor quantum dots, depends on the accuracy of functionals developed for the exchange and correlation energies. Here we extend a successful approximation for the correlation energy of the three dimensional inhomogeneous electron gas, originally introduced by Becke [J. Chem. Phys. {\bf 88}, 1053 (1988)], to the two-dimensional case. The approach aims to non-empirical modeling of the correlation-hole functions satisfying a set of exact properties. Furthermore, the electron current and spin are explicitly taken into account. As a result, good performance is obtained in comparison with numerically exact data for quantum dots with varying external magnetic field, and for the homogeneous two-dimensional electron gas, respectively.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2009-02-24 |