Electronic structure of rectangular quantum dots

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Journal Title
Journal ISSN
Volume Title
School of Science | A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
Date
2003
Major/Subject
Mcode
Degree programme
Language
en
Pages
235307/1-8
Series
Physical Review B, Volume 67, Issue 23
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.
Description
Keywords
rectangular quantum dots, density-functional theory, quantum Monte Carlo, spin density waves, quantum wires
Other note
Citation
Räsänen, E. & Saarikoski, H. & Stavrou, V. N. & Harju, A. & Puska, M. J. & Nieminen, Risto M. 2003. Electronic structure of rectangular quantum dots. Physical Review B. Volume 67, Issue 23. 235307/1-8. ISSN 1550-235X (electronic). DOI: 10.1103/physrevb.67.235307.