Quantum dot spin effect on the conductance of a quantum wire

A numerically exact calculation of the (formula presented) transport properties of a quantum wire interacting with a lateral two-level quantum dot is presented. The wire conductance is calculated for all different states of charge and spin of the quantum dot. For a dot with two electrons we obtain a...

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Autores principales: Davidovich, M.A., Anda, E.V., Büsser, C.A., Chiappe, G.
Formato: JOUR
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_10980121_v65_n23_p1_Davidovich
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spelling todo:paper_10980121_v65_n23_p1_Davidovich2023-10-03T16:05:45Z Quantum dot spin effect on the conductance of a quantum wire Davidovich, M.A. Anda, E.V. Büsser, C.A. Chiappe, G. A numerically exact calculation of the (formula presented) transport properties of a quantum wire interacting with a lateral two-level quantum dot is presented. The wire conductance is calculated for all different states of charge and spin of the quantum dot. For a dot with two electrons we obtain an enhancement of the Kondo temperature at the singlet-triplet transition and a nonuniversal scaling law for its dependence upon the dot energy spacing. We find that the Kondo correlation is stronger for a dot spin (formula presented) than for (formula presented) In both cases the wire current is totally quenched by the Kondo effect. When the dot is in the mixed-valence regime and (formula presented) the wire conductance is partially quenched except in a very small region of gate potential where it reaches the maximum value (formula presented). © 2002 The American Physical Society. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_10980121_v65_n23_p1_Davidovich
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
description A numerically exact calculation of the (formula presented) transport properties of a quantum wire interacting with a lateral two-level quantum dot is presented. The wire conductance is calculated for all different states of charge and spin of the quantum dot. For a dot with two electrons we obtain an enhancement of the Kondo temperature at the singlet-triplet transition and a nonuniversal scaling law for its dependence upon the dot energy spacing. We find that the Kondo correlation is stronger for a dot spin (formula presented) than for (formula presented) In both cases the wire current is totally quenched by the Kondo effect. When the dot is in the mixed-valence regime and (formula presented) the wire conductance is partially quenched except in a very small region of gate potential where it reaches the maximum value (formula presented). © 2002 The American Physical Society.
format JOUR
author Davidovich, M.A.
Anda, E.V.
Büsser, C.A.
Chiappe, G.
spellingShingle Davidovich, M.A.
Anda, E.V.
Büsser, C.A.
Chiappe, G.
Quantum dot spin effect on the conductance of a quantum wire
author_facet Davidovich, M.A.
Anda, E.V.
Büsser, C.A.
Chiappe, G.
author_sort Davidovich, M.A.
title Quantum dot spin effect on the conductance of a quantum wire
title_short Quantum dot spin effect on the conductance of a quantum wire
title_full Quantum dot spin effect on the conductance of a quantum wire
title_fullStr Quantum dot spin effect on the conductance of a quantum wire
title_full_unstemmed Quantum dot spin effect on the conductance of a quantum wire
title_sort quantum dot spin effect on the conductance of a quantum wire
url http://hdl.handle.net/20.500.12110/paper_10980121_v65_n23_p1_Davidovich
work_keys_str_mv AT davidovichma quantumdotspineffectontheconductanceofaquantumwire
AT andaev quantumdotspineffectontheconductanceofaquantumwire
AT busserca quantumdotspineffectontheconductanceofaquantumwire
AT chiappeg quantumdotspineffectontheconductanceofaquantumwire
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