Electronic structure calculations of quantum dots

Kenji Hirose, Ned S. Wingreen

Research output: Contribution to journalArticle

Abstract

Recent experiments revealing the atomic-like spectra in quantum dots call for quantitative theoretical tools. We present a study of the electronic structure of two-dimensional quantum dots up to 58 electrons using Current-Density-Functional Theory (CDFT), which enables us to obtain the ground state energy including the effects of an external magnetic field. We observe a shell structure for the filling of the dot with electrons. Hund's rule determines the spin configuration of the ground state, but only up to 22 electrons. After that, orbital degeneracies are lifted by the non-parabolic effective potential, and high spin states are suppressed. At specific N, a small deformation of the external potential induces a rotational Charge-Density-Wave (CDW) state. In the presence of magnetic fields up to 4.5 T, the dot shows four distinct regimes. We present the magnetic field dependence of the addition spectrum, total angular momentum, and spin configuration.

Original languageEnglish (US)
Pages (from-to)419-423
Number of pages5
JournalNEC Research and Development
Volume40
Issue number4
StatePublished - Oct 1 1999

All Science Journal Classification (ASJC) codes

  • Electrical and Electronic Engineering

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