Electronic structure of rectangular quantum dots

Esa Räsänen, H. Saarikoski, V.N. Stavrou, A. Harju, M.J. Puska, R.M. Nieminen

Research output: Contribution to journalArticleScientificpeer-review

78 Citations (Scopus)
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Abstract

We study the ground-state properties of rectangular quantum dots by using the spin-density-functional theory and quantum Monte Carlo methods. The dot geometry is determined by an infinite hard-wall potential to enable comparison to manufactured, rectangular-shaped quantum dots. We show that the electronic structure is very sensitive to the shape of the dot, and, at realistic sizes, the noninteracting picture determines the general behavior. However, close to the degenerate points where Hund’s rule applies, we find spin-density-wave-like solutions bracketing the partially polarized states. In the quasi-one-dimensional limit we find permanent charge-density waves, and at a sufficiently large deformation or low density, there are strongly localized stable states with a broken spin symmetry.
Original languageEnglish
Article number235307
Pages (from-to)1-8
Number of pages8
JournalPhysical Review B
Volume67
Issue number23
DOIs
Publication statusPublished - 10 Jun 2003
MoE publication typeA1 Journal article-refereed

Keywords

  • density-functional theory
  • quantum Monte Carlo
  • quantum wire
  • rectangular quantum dot
  • spin density wave

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