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Addition energies and density dipole response of quantum rings under the influence of in-plane electric fields

AutorMalet, Francesc; Pi, Martí; Barranco, Manuel; Serra, Llorenç ; Lipparini, Enrico
Palabras claveCoulomb blockade
Density functional theory
Ground states
Quantum dots
Spin systems
Fecha de publicación3-dic-2007
EditorAmerican Physical Society
CitaciónPhysical Review B 76, 245302 (2007)
ResumenWithin density functional theory, we address the effect of an in-plane electric field [script E] on the ground state and the density dipole response of a many-electron quantum ring, which is also submitted to a perpendicular magnetic field B. Addition energies and density dipole spectra are discussed as a function of [script E]. For the two-electron case, an exact numerical calculation is performed, obtaining the spin-phase diagram in the [script E]-B plane and showing that transitions between singlet and triplet spin states can be induced by varying the fields. We also find that, in spite of the deformation that [script E] causes in the electronic density, the spin of the ground state of a given electron number ring is very robust, changing little as the strength of the electric field is reasonably increased.
Descripción6 pages.-- PACS numbers: 73.21.-b, 73.22.-f, 71.15.Mb.-- Final full-text version of the paper available at: http://dx.doi.org/10.1103/PhysRevB.76.245302.
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