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Spontaneous magnetism of quantum dot lattices

Koskinen, M; Reimann, Stephanie LU and Manninen, M (2003) In Physical Review Letters 90(6: 066802).
Abstract
The magnetism of square lattices of quantum dots with up to 12 electrons per dot is studied using the spin-density functional formalism. At small values of the lattice constant, all lattices are nonmagnetic and gapless. When the lattice constant is increased, the shell structure of the single dots governs the magnetism of the lattice. At closed shells, the lattices are nonmagnetic and have a gap at the Fermi level. At the beginning and at the end of a shell, they become ferromagnetic and stay gapless up to large values of the lattice constant. Antiferromagnetism was observed only at midshell after a band gap was opened.
Please use this url to cite or link to this publication:
author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Physical Review Letters
volume
90
issue
6: 066802
publisher
American Physical Society
external identifiers
  • wos:000181015900039
ISSN
1079-7114
DOI
10.1103/PhysRevLett.90.066802
language
English
LU publication?
yes
id
16346861-b9a3-49ea-bf82-8c318a07da5e (old id 317470)
date added to LUP
2007-09-16 09:56:46
date last changed
2016-09-20 04:59:41
@article{16346861-b9a3-49ea-bf82-8c318a07da5e,
  abstract     = {The magnetism of square lattices of quantum dots with up to 12 electrons per dot is studied using the spin-density functional formalism. At small values of the lattice constant, all lattices are nonmagnetic and gapless. When the lattice constant is increased, the shell structure of the single dots governs the magnetism of the lattice. At closed shells, the lattices are nonmagnetic and have a gap at the Fermi level. At the beginning and at the end of a shell, they become ferromagnetic and stay gapless up to large values of the lattice constant. Antiferromagnetism was observed only at midshell after a band gap was opened.},
  author       = {Koskinen, M and Reimann, Stephanie and Manninen, M},
  issn         = {1079-7114},
  language     = {eng},
  number       = {6: 066802},
  publisher    = {American Physical Society},
  series       = {Physical Review Letters},
  title        = {Spontaneous magnetism of quantum dot lattices},
  url          = {http://dx.doi.org/10.1103/PhysRevLett.90.066802},
  volume       = {90},
  year         = {2003},
}