6533b7dafe1ef96bd126f611
RESEARCH PRODUCT
Spontaneous magnetism of quantum dot lattices.
Stephanie ReimannM KoskinenM. Manninensubject
PhysicsCondensed matter physicsMagnetismBand gapHigh Energy Physics::LatticeFermi levelGeneral Physics and AstronomyCondensed Matter::Mesoscopic Systems and Quantum Hall Effectsymbols.namesakeLattice constantFerromagnetismQuantum dotLattice (order)symbolsAntiferromagnetismCondensed Matter::Strongly Correlated Electronsdescription
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.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2003-02-13 | Physical review letters |