Time-dependent density functional theory of excitation energies of closed-shell quantum dots

Kenji Hirose, Yigal Meir, Ned S. Wingreen

Research output: Contribution to journalConference articlepeer-review

6 Scopus citations

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 languageEnglish
Pages (from-to)486-489
Number of pages4
JournalPhysica E: Low-Dimensional Systems and Nanostructures
Volume22
Issue number1-3
DOIs
StatePublished - 1 Apr 2004
Event15th International Conference on ELectronic Propreties - Nara, Japan
Duration: 14 Jul 200318 Jul 2003

Keywords

  • Excitation energy
  • Quantum dots
  • Time-dependent density functional theory

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