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Magnetism in one-dimensional quantum dot arrays

Kärkkäinen, Kimmo; Koskinen, Matti; Reimann, Stephanie LU and Manninen, Matti (2005) In Physical Review B (Condensed Matter and Materials Physics) 72(16). p.165324-165330
Abstract
We employ the density functional Kohn-Sham method in the local spin-density approximation to study the electronic structure and magnetism of quasi-one-dimensional periodic arrays of few-electron quantum dots. At small values of the lattice constant, the single dots overlap, forming a nonmagnetic quantum wire with nearly homogenous density. As the confinement perpendicular to the wire is increased, i.e., as the wire is squeezed to become more one dimensional, it undergoes a spin-Peierls transition. Magnetism sets in as the quantum dots are placed farther apart. It is determined by the electronic shell filling of the individual quantum dots. At larger values of the lattice constant, the band structure for odd numbers of electrons per dot... (More)
We employ the density functional Kohn-Sham method in the local spin-density approximation to study the electronic structure and magnetism of quasi-one-dimensional periodic arrays of few-electron quantum dots. At small values of the lattice constant, the single dots overlap, forming a nonmagnetic quantum wire with nearly homogenous density. As the confinement perpendicular to the wire is increased, i.e., as the wire is squeezed to become more one dimensional, it undergoes a spin-Peierls transition. Magnetism sets in as the quantum dots are placed farther apart. It is determined by the electronic shell filling of the individual quantum dots. At larger values of the lattice constant, the band structure for odd numbers of electrons per dot indicates that the array could support spin-polarized transport and therefore act as a spin filter. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Physical Review B (Condensed Matter and Materials Physics)
volume
72
issue
16
pages
165324 - 165330
publisher
American Physical Society
external identifiers
  • wos:000232934900073
  • scopus:29644436599
ISSN
1098-0121
DOI
10.1103/PhysRevB.72.165324
language
English
LU publication?
yes
id
5a0b8e07-f4a6-49a5-83d6-a62752fb0192 (old id 838110)
date added to LUP
2008-01-08 11:49:14
date last changed
2017-01-01 06:39:43
@article{5a0b8e07-f4a6-49a5-83d6-a62752fb0192,
  abstract     = {We employ the density functional Kohn-Sham method in the local spin-density approximation to study the electronic structure and magnetism of quasi-one-dimensional periodic arrays of few-electron quantum dots. At small values of the lattice constant, the single dots overlap, forming a nonmagnetic quantum wire with nearly homogenous density. As the confinement perpendicular to the wire is increased, i.e., as the wire is squeezed to become more one dimensional, it undergoes a spin-Peierls transition. Magnetism sets in as the quantum dots are placed farther apart. It is determined by the electronic shell filling of the individual quantum dots. At larger values of the lattice constant, the band structure for odd numbers of electrons per dot indicates that the array could support spin-polarized transport and therefore act as a spin filter.},
  author       = {Kärkkäinen, Kimmo and Koskinen, Matti and Reimann, Stephanie and Manninen, Matti},
  issn         = {1098-0121},
  language     = {eng},
  number       = {16},
  pages        = {165324--165330},
  publisher    = {American Physical Society},
  series       = {Physical Review B (Condensed Matter and Materials Physics)},
  title        = {Magnetism in one-dimensional quantum dot arrays},
  url          = {http://dx.doi.org/10.1103/PhysRevB.72.165324},
  volume       = {72},
  year         = {2005},
}