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Title: Addition energies and density dipole response of quantum rings under the influence of in-plane electric fields
Author: Malet i Giralt, Francesc
Pi Pericay, Martí
Barranco Gómez, Manuel
Serra, Llorenç
Lipparini, Enrico
Keywords: Estructura electrònica
Spin (Física nuclear)
Electrònica quàntica
Teoria del funcional de densitat
Electronic structure
Nuclear spin
Quantum electronics
Density functional theory
Issue Date: 2007
Publisher: The American Physical Society
Abstract: Within 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.
Note: Reproducció digital del document publicat en format paper, proporcionada per
It is part of: Physical Review B, 2007, vol. 76, núm. 24, p. 245302-1-245302-6
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ISSN: 0163-1829
Appears in Collections:Articles publicats en revistes (Física Quàntica i Astrofísica)

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