Conductance through two quantum dots in a ring: Magnetic flux dependence
The conductance of a double-dot system in a ring threaded by a magnetic flux is studied. The ring is connected to two leads in such a way that each dot is embedded in one arm of the structure. The currents going through each arm of the ring are determined by the Aharonov-Bohm effect and the dot char...
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| Autores principales: | , , , |
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| Formato: | Artículo publishedVersion |
| Publicado: |
2006
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| Acceso en línea: | http://hdl.handle.net/20.500.12110/paper_01039733_v36_n2A_p408_Apel https://repositoriouba.sisbi.uba.ar/gsdl/cgi-bin/library.cgi?a=d&c=artiaex&d=paper_01039733_v36_n2A_p408_Apel_oai |
| Aporte de: |
| Sumario: | The conductance of a double-dot system in a ring threaded by a magnetic flux is studied. The ring is connected to two leads in such a way that each dot is embedded in one arm of the structure. The currents going through each arm of the ring are determined by the Aharonov-Bohm effect and the dot charging effects. The conductance for different values of the magnetic flux is obtained as a function of the gate potentials applied to the dots, for two situations: when the dot level energies are equal, ΔE = 0, and when they are different but with ΔE smaller than the Coulomb interaction U. The conductance shows quite distinct behavior according to having a finite or zero magnetic flux threading the ring. The system presents S = 1/2 and S = l Kondo phenomena for no magnetic flux and is in the S = 1/2 Kondo regime in the case of half a quantum of magnetic flux. |
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