Vertically coupled double quantum rings at zero magnetic field

Within local-spin-density functional theory, we have investigated the ¿dissociation¿ of few-electron circular vertical semiconductor double quantum ring artificial molecules at zero magnetic field as a function of interring distance. In a first step, the molecules are constituted by two identical qu...

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Autores: Malet i Giralt, Francesc, Barranco Gómez, Manuel, Lipparini, Enrico, Mayol Sánchez, Ricardo, Pi Pericay, Martí, Climente, J. I., Planelles, Josep (Planelles Fuster)
Tipo de recurso: artículo
Estado:Versión publicada
Fecha de publicación:2006
País:España
Institución:Varias* (Consorci de Biblioteques Universitáries de Catalunya, Centre de Serveis Científics i Acadèmics de Catalunya)
Repositorio:Recercat. Dipósit de la Recerca de Catalunya
OAI Identifier:oai:recercat.cat:2445/10568
Acceso en línea:https://hdl.handle.net/2445/10568
Access Level:acceso abierto
Palabra clave:Semiconductors
Estructura electrònica
Electrònica quàntica
Electronic structure
Quantum electronics
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spelling Vertically coupled double quantum rings at zero magnetic fieldMalet i Giralt, FrancescBarranco Gómez, ManuelLipparini, EnricoMayol Sánchez, RicardoPi Pericay, MartíClimente, J. I.Planelles, Josep (Planelles Fuster)SemiconductorsEstructura electrònicaElectrònica quànticaSemiconductorsElectronic structureQuantum electronicsWithin local-spin-density functional theory, we have investigated the ¿dissociation¿ of few-electron circular vertical semiconductor double quantum ring artificial molecules at zero magnetic field as a function of interring distance. In a first step, the molecules are constituted by two identical quantum rings. When the rings are quantum mechanically strongly coupled, the electronic states are substantially delocalized, and the addition energy spectra of the artificial molecule resemble those of a single quantum ring in the few-electron limit. When the rings are quantum mechanically weakly coupled, the electronic states in the molecule are substantially localized in one ring or the other, although the rings can be electrostatically coupled. The effect of a slight mismatch introduced in the molecules from nominally identical quantum wells, or from changes in the inner radius of the constituent rings, induces localization by offsetting the energy levels in the quantum rings. This plays a crucial role in the appearance of the addition spectra as a function of coupling strength particularly in the weak coupling limit.The American Physical Society200920092006info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersion7 p.application/pdfhttps://hdl.handle.net/2445/10568Articles publicats en revistes (Física Quàntica i Astrofísica)reponame:Recercat. Dipósit de la Recerca de Catalunyainstname:Varias* (Consorci de Biblioteques Universitáries de Catalunya, Centre de Serveis Científics i Acadèmics de Catalunya)InglésReproducció digital del document publicat en format paper, proporcionada per PROLA i http://dx.doi.org/10.1103/PhysRevB.73.245324Physical Review B, 2006, vol. 73, num. 24, p. 245324-1-245324-7http://dx.doi.org/10.1103/PhysRevB.73.245324(c) The American Physical Society, 2006info:eu-repo/semantics/openAccessoai:recercat.cat:2445/105682026-05-29T05:05:01Z
dc.title.none.fl_str_mv Vertically coupled double quantum rings at zero magnetic field
title Vertically coupled double quantum rings at zero magnetic field
spellingShingle Vertically coupled double quantum rings at zero magnetic field
Malet i Giralt, Francesc
Semiconductors
Estructura electrònica
Electrònica quàntica
Semiconductors
Electronic structure
Quantum electronics
title_short Vertically coupled double quantum rings at zero magnetic field
title_full Vertically coupled double quantum rings at zero magnetic field
title_fullStr Vertically coupled double quantum rings at zero magnetic field
title_full_unstemmed Vertically coupled double quantum rings at zero magnetic field
title_sort Vertically coupled double quantum rings at zero magnetic field
dc.creator.none.fl_str_mv Malet i Giralt, Francesc
Barranco Gómez, Manuel
Lipparini, Enrico
Mayol Sánchez, Ricardo
Pi Pericay, Martí
Climente, J. I.
Planelles, Josep (Planelles Fuster)
author Malet i Giralt, Francesc
author_facet Malet i Giralt, Francesc
Barranco Gómez, Manuel
Lipparini, Enrico
Mayol Sánchez, Ricardo
Pi Pericay, Martí
Climente, J. I.
Planelles, Josep (Planelles Fuster)
author_role author
author2 Barranco Gómez, Manuel
Lipparini, Enrico
Mayol Sánchez, Ricardo
Pi Pericay, Martí
Climente, J. I.
Planelles, Josep (Planelles Fuster)
author2_role author
author
author
author
author
author
dc.subject.none.fl_str_mv Semiconductors
Estructura electrònica
Electrònica quàntica
Semiconductors
Electronic structure
Quantum electronics
topic Semiconductors
Estructura electrònica
Electrònica quàntica
Semiconductors
Electronic structure
Quantum electronics
description Within local-spin-density functional theory, we have investigated the ¿dissociation¿ of few-electron circular vertical semiconductor double quantum ring artificial molecules at zero magnetic field as a function of interring distance. In a first step, the molecules are constituted by two identical quantum rings. When the rings are quantum mechanically strongly coupled, the electronic states are substantially delocalized, and the addition energy spectra of the artificial molecule resemble those of a single quantum ring in the few-electron limit. When the rings are quantum mechanically weakly coupled, the electronic states in the molecule are substantially localized in one ring or the other, although the rings can be electrostatically coupled. The effect of a slight mismatch introduced in the molecules from nominally identical quantum wells, or from changes in the inner radius of the constituent rings, induces localization by offsetting the energy levels in the quantum rings. This plays a crucial role in the appearance of the addition spectra as a function of coupling strength particularly in the weak coupling limit.
publishDate 2006
dc.date.none.fl_str_mv 2006
2009
2009
dc.type.none.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
format article
status_str publishedVersion
dc.identifier.none.fl_str_mv https://hdl.handle.net/2445/10568
url https://hdl.handle.net/2445/10568
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
dc.relation.none.fl_str_mv Reproducció digital del document publicat en format paper, proporcionada per PROLA i http://dx.doi.org/10.1103/PhysRevB.73.245324
Physical Review B, 2006, vol. 73, num. 24, p. 245324-1-245324-7
http://dx.doi.org/10.1103/PhysRevB.73.245324
dc.rights.none.fl_str_mv (c) The American Physical Society, 2006
info:eu-repo/semantics/openAccess
rights_invalid_str_mv (c) The American Physical Society, 2006
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv 7 p.
application/pdf
dc.publisher.none.fl_str_mv The American Physical Society
publisher.none.fl_str_mv The American Physical Society
dc.source.none.fl_str_mv Articles publicats en revistes (Física Quàntica i Astrofísica)
reponame:Recercat. Dipósit de la Recerca de Catalunya
instname:Varias* (Consorci de Biblioteques Universitáries de Catalunya, Centre de Serveis Científics i Acadèmics de Catalunya)
instname_str Varias* (Consorci de Biblioteques Universitáries de Catalunya, Centre de Serveis Científics i Acadèmics de Catalunya)
reponame_str Recercat. Dipósit de la Recerca de Catalunya
collection Recercat. Dipósit de la Recerca de Catalunya
repository.name.fl_str_mv
repository.mail.fl_str_mv
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score 15.81155

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