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Título: | Addition energies and density dipole response of quantum rings under the influence of in-plane electric fields |
Autor: | Malet, Francesc; Pi, Martí; Barranco, Manuel; Serra, Llorenç CSIC ORCID ; Lipparini, Enrico | Palabras clave: | Coulomb blockade Density functional theory Ground states Quantum dots Spin systems |
Fecha de publicación: | 3-dic-2007 | Editor: | American Physical Society | Citación: | Physical Review B 76, 245302 (2007) | Resumen: | 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. | Descripción: | 6 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. | URI: | http://hdl.handle.net/10261/6100 | DOI: | 10.1103/PhysRevB.76.245302 | ISSN: | 1098-0121 |
Aparece en las colecciones: | (IFISC) Artículos |
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PhysRevB_76_245302.pdf | 186,45 kB | Adobe PDF | Visualizar/Abrir |
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