Abstract
We study the low-energy excitations of two-dimensional elliptical quantum dots with closed-shell structures using time-dependent density functional theory (TDDFT). We find that TDDFT gives fairly accurate results for the low-energy excitations and describes the spin singlet-triplet transition due to the exchange energy. The deviations from exact-diagonalization results are less than 0.20 meV. We show the dependence of excitation energies on the strength of Coulomb interaction and the photoabsorption spectra.
Original language | English |
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Pages (from-to) | 486-489 |
Number of pages | 4 |
Journal | Physica E: Low-Dimensional Systems and Nanostructures |
Volume | 22 |
Issue number | 1-3 |
DOIs | |
State | Published - 1 Apr 2004 |
Event | 15th International Conference on ELectronic Propreties - Nara, Japan Duration: 14 Jul 2003 → 18 Jul 2003 |
Keywords
- Excitation energy
- Quantum dots
- Time-dependent density functional theory
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Atomic and Molecular Physics, and Optics
- Condensed Matter Physics