Kondo effect and persistent currents in a mesoscopic ring: Numerically exact results
We study the persistent current circulating along a mesoscopic ring with a dot side coupled to it when threaded by a magnetic field. A cluster including the dot and its vicinity is diagonalized and embedded into the rest of the system. The result is numerically exact. We show that a ring of any size...
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| Acceso en línea: | http://hdl.handle.net/20.500.12110/paper_10980121_v66_n3_p1_Anda |
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todo:paper_10980121_v66_n3_p1_Anda2023-10-03T16:05:46Z Kondo effect and persistent currents in a mesoscopic ring: Numerically exact results Anda, E.V. Busser, C. Chiappe, G. Davidovich, M.A. We study the persistent current circulating along a mesoscopic ring with a dot side coupled to it when threaded by a magnetic field. A cluster including the dot and its vicinity is diagonalized and embedded into the rest of the system. The result is numerically exact. We show that a ring of any size can have the properties of a Kondo ground state, although for small size it depends upon the configuration of the highest occupied ring levels. In the Kondo regime, the states in the vicinity of the Fermi level do not contribute to the persistent current, although it gets the contribution of the states below (formula presented) This clarifies previous interpretations. When the dot is near resonance, the current can depend smoothly or strongly on the gate potential, according to the structure of occupation of the highest energetic electrons of the system. © 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_v66_n3_p1_Anda |
| institution |
Universidad de Buenos Aires |
| institution_str |
I-28 |
| repository_str |
R-134 |
| collection |
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) |
| description |
We study the persistent current circulating along a mesoscopic ring with a dot side coupled to it when threaded by a magnetic field. A cluster including the dot and its vicinity is diagonalized and embedded into the rest of the system. The result is numerically exact. We show that a ring of any size can have the properties of a Kondo ground state, although for small size it depends upon the configuration of the highest occupied ring levels. In the Kondo regime, the states in the vicinity of the Fermi level do not contribute to the persistent current, although it gets the contribution of the states below (formula presented) This clarifies previous interpretations. When the dot is near resonance, the current can depend smoothly or strongly on the gate potential, according to the structure of occupation of the highest energetic electrons of the system. © 2002 The American Physical Society. |
| format |
JOUR |
| author |
Anda, E.V. Busser, C. Chiappe, G. Davidovich, M.A. |
| spellingShingle |
Anda, E.V. Busser, C. Chiappe, G. Davidovich, M.A. Kondo effect and persistent currents in a mesoscopic ring: Numerically exact results |
| author_facet |
Anda, E.V. Busser, C. Chiappe, G. Davidovich, M.A. |
| author_sort |
Anda, E.V. |
| title |
Kondo effect and persistent currents in a mesoscopic ring: Numerically exact results |
| title_short |
Kondo effect and persistent currents in a mesoscopic ring: Numerically exact results |
| title_full |
Kondo effect and persistent currents in a mesoscopic ring: Numerically exact results |
| title_fullStr |
Kondo effect and persistent currents in a mesoscopic ring: Numerically exact results |
| title_full_unstemmed |
Kondo effect and persistent currents in a mesoscopic ring: Numerically exact results |
| title_sort |
kondo effect and persistent currents in a mesoscopic ring: numerically exact results |
| url |
http://hdl.handle.net/20.500.12110/paper_10980121_v66_n3_p1_Anda |
| work_keys_str_mv |
AT andaev kondoeffectandpersistentcurrentsinamesoscopicringnumericallyexactresults AT busserc kondoeffectandpersistentcurrentsinamesoscopicringnumericallyexactresults AT chiappeg kondoeffectandpersistentcurrentsinamesoscopicringnumericallyexactresults AT davidovichma kondoeffectandpersistentcurrentsinamesoscopicringnumericallyexactresults |
| _version_ |
1807314610811830272 |