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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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 |
_version_ |
1807323006821728256 |