Transport across two interacting quantum dots: Bulk Kondo, Kondo box, and molecular regimes

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Título: Transport across two interacting quantum dots: Bulk Kondo, Kondo box, and molecular regimes
Autor/es: Ribeiro, Laercio Costa | Hamad, Ignacio | Chiappe, Guillermo | Anda, Enrique Victoriano
Grupo/s de investigación o GITE: Física de la Materia Condensada
Centro, Departamento o Servicio: Universidad de Alicante. Departamento de Física Aplicada | Universidad de Alicante. Instituto Universitario de Materiales
Palabras clave: Quantum dots | Bulk Kondo | Kondo box | Molecular regimes
Área/s de conocimiento: Física Aplicada
Fecha de publicación: 14-ene-2014
Editor: American Physical Society
Cita bibliográfica: Phys. Rev. B 89, 045412. doi:10.1103/PhysRevB.89.045412
Resumen: We analyze the transport properties of a double quantum dot device with both dots coupled to perfect conducting leads and to a finite chain of N noninteracting sites connecting both of them. The interdot chain strongly influences the transport across the system and the local density of states of the dots. We study the case of a small number of sites, so that Kondo box effects are present, varying the coupling between the dots and the chain. For odd N and small coupling between the interdot chain and the dots, a state with two coexisting Kondo regimes develops: the bulk Kondo due to the quantum dots connected to leads and the one produced by the screening of the quantum dot spins by the spin in the finite chain at the Fermi level. As the coupling to the interdot chain increases, there is a crossover to a molecular Kondo effect, due to the screening of the molecule (formed by the finite chain and the quantum dots) spin by the leads. For even N the two Kondo temperatures regime does not develop and the physics is dominated by the usual competition between Kondo and antiferromagnetism between the quantum dots. We finally study how the transport properties are affected as N is increased. For the study we used exact multiconfigurational Lanczos calculations and finite-U slave-boson mean-field theory at T=0. The results obtained with both methods describe qualitatively and also quantitatively the same physics.
Patrocinador/es: We acknowledge financial support from the Brazilian agencies FAPERJ (CNE) and CNPq, the Spanish MCYT (Grants No. FIS2009-10325 and No. FIS2012-35880), CONICET (Argentina), Universidad de Alicante, and PUC–Rio de Janeiro.
URI: http://hdl.handle.net/10045/50027
ISSN: 1098-0121 (Print) | 1550-235X (Online)
DOI: 10.1103/PhysRevB.89.045412
Idioma: eng
Tipo: info:eu-repo/semantics/article
Derechos: ©2014 American Physical Society
Revisión científica: si
Versión del editor: http://dx.doi.org/10.1103/PhysRevB.89.045412
Aparece en las colecciones:INV - Física de la Materia Condensada - Artículos de Revistas

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