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Tunable Kondo Effect of a Three-Terminal Transport Quantum Dot Embedded in an Aharonov--Bohm Ring |
| CHEN Xiong-Wen1,2;SHI Zhen-Gang1,2;WU Shao-Quan3;SONG Ke-Hui1,2 |
| 1Department of Physics and Electronic Information Science, Huaihua University, Huaihua 418008
2Research Institute of Information Science, Huaihua University, Huaihua 418008 |
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| Cite this article: |
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CHEN Xiong-Wen, SHI Zhen-Gang, WU Shao-Quan et al 2006 Chin. Phys. Lett. 23 439-442 |
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Abstract We theoretically investigate the Kondo effect of a three-terminal transport quantum dot (QD) embedded in an Aharonov--Bohm ring in the Kondo regime by means of the one-impurity Anderson Hamiltonian. The Hamiltonian is solved by means of the slave-boson mean-field theory. We find that in this system, the Kondo effect depends sensitively on the parity and size of the ring; the Kondo screening cloud can be tuned by tuning the coupling strength of the reservoir-dot. Thus this model might be a candidate for future device applications.
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| Keywords:
72.10.Fk
72.15.Qm
73.23.Ra
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Published: 01 February 2006
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| PACS: |
72.10.Fk
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(Scattering by point defects, dislocations, surfaces, and other imperfections (including Kondo effect))
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72.15.Qm
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(Scattering mechanisms and Kondo effect)
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73.23.Ra
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(Persistent currents)
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