Effect of topology on the transport properties of two interacting dots

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The transport properties of a system of two interacting dots, one of them directly connected to the leads constituting a side-coupled configuration (SCD), are studied in the weak and strong tunnelcoupling limits. The conductance behavior of the SCD structure has new and richer physics than the bette...

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Autores principales: Apel, V.M., Davidovich, M.A., Anda, E.V., Chiappe, G., Busser, C.A.
Formato: JOUR
Materias:
Antiferromagnetic materials
Correlation methods
Coulomb blockade
Electron scattering
Ferromagnetic materials
Nanostructured materials
Topology
Transport properties
Coulomb interactions
Ferromagnetic correlations
Kondo correlation
Side-coupled configuration (SCD)
Semiconductor quantum dots
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_14346028_v40_n4_p365_Apel
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id todo:paper_14346028_v40_n4_p365_Apel
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spelling todo:paper_14346028_v40_n4_p365_Apel2023-10-03T16:14:31Z Effect of topology on the transport properties of two interacting dots Apel, V.M. Davidovich, M.A. Anda, E.V. Chiappe, G. Busser, C.A. Antiferromagnetic materials Correlation methods Coulomb blockade Electron scattering Ferromagnetic materials Nanostructured materials Topology Transport properties Coulomb interactions Ferromagnetic correlations Kondo correlation Side-coupled configuration (SCD) Semiconductor quantum dots The transport properties of a system of two interacting dots, one of them directly connected to the leads constituting a side-coupled configuration (SCD), are studied in the weak and strong tunnelcoupling limits. The conductance behavior of the SCD structure has new and richer physics than the better-studied system of two dots aligned With the leads (ACD). In the weak coupling regime and in the case of one electron per dot, the ACD configuration gives rise to two mostly independent Kondo states. In the SCD topology, the inserted dot is in a Kondo state while the side-connected one presents Coulomb blockade properties. Moreover, the dot spins change their behavior, from an antiferromagnetic coupling to a ferromagnetic correlation, as a consequence of the interaction with the conduction electrons. The system is governed by the Kondo effect related to the dot that is embedded into the leads. The role of the side-connected dot is to introduce, when at resonance, a new path for the electrons to go through giving rise to the interferences responsible for the suppression of the conductance. These results depend on the values of the intra-dot Coulomb interactions. In the case where the many-body interaction is restricted to the side-connected dot, its Kondo correlation is responsible for the scattering of the conduction electrons giving rise to the conductance suppression. Fil:Apel, V.M. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_14346028_v40_n4_p365_Apel
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic Antiferromagnetic materials
Correlation methods
Coulomb blockade
Electron scattering
Ferromagnetic materials
Nanostructured materials
Topology
Transport properties
Coulomb interactions
Ferromagnetic correlations
Kondo correlation
Side-coupled configuration (SCD)
Semiconductor quantum dots
spellingShingle Antiferromagnetic materials
Correlation methods
Coulomb blockade
Electron scattering
Ferromagnetic materials
Nanostructured materials
Topology
Transport properties
Coulomb interactions
Ferromagnetic correlations
Kondo correlation
Side-coupled configuration (SCD)
Semiconductor quantum dots
Apel, V.M.
Davidovich, M.A.
Anda, E.V.
Chiappe, G.
Busser, C.A.
Effect of topology on the transport properties of two interacting dots
topic_facet Antiferromagnetic materials
Correlation methods
Coulomb blockade
Electron scattering
Ferromagnetic materials
Nanostructured materials
Topology
Transport properties
Coulomb interactions
Ferromagnetic correlations
Kondo correlation
Side-coupled configuration (SCD)
Semiconductor quantum dots
description The transport properties of a system of two interacting dots, one of them directly connected to the leads constituting a side-coupled configuration (SCD), are studied in the weak and strong tunnelcoupling limits. The conductance behavior of the SCD structure has new and richer physics than the better-studied system of two dots aligned With the leads (ACD). In the weak coupling regime and in the case of one electron per dot, the ACD configuration gives rise to two mostly independent Kondo states. In the SCD topology, the inserted dot is in a Kondo state while the side-connected one presents Coulomb blockade properties. Moreover, the dot spins change their behavior, from an antiferromagnetic coupling to a ferromagnetic correlation, as a consequence of the interaction with the conduction electrons. The system is governed by the Kondo effect related to the dot that is embedded into the leads. The role of the side-connected dot is to introduce, when at resonance, a new path for the electrons to go through giving rise to the interferences responsible for the suppression of the conductance. These results depend on the values of the intra-dot Coulomb interactions. In the case where the many-body interaction is restricted to the side-connected dot, its Kondo correlation is responsible for the scattering of the conduction electrons giving rise to the conductance suppression.
format JOUR
author Apel, V.M.
Davidovich, M.A.
Anda, E.V.
Chiappe, G.
Busser, C.A.
author_facet Apel, V.M.
Davidovich, M.A.
Anda, E.V.
Chiappe, G.
Busser, C.A.
author_sort Apel, V.M.
title Effect of topology on the transport properties of two interacting dots
title_short Effect of topology on the transport properties of two interacting dots
title_full Effect of topology on the transport properties of two interacting dots
title_fullStr Effect of topology on the transport properties of two interacting dots
title_full_unstemmed Effect of topology on the transport properties of two interacting dots
title_sort effect of topology on the transport properties of two interacting dots
url http://hdl.handle.net/20.500.12110/paper_14346028_v40_n4_p365_Apel
work_keys_str_mv AT apelvm effectoftopologyonthetransportpropertiesoftwointeractingdots
AT davidovichma effectoftopologyonthetransportpropertiesoftwointeractingdots
AT andaev effectoftopologyonthetransportpropertiesoftwointeractingdots
AT chiappeg effectoftopologyonthetransportpropertiesoftwointeractingdots
AT busserca effectoftopologyonthetransportpropertiesoftwointeractingdots
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