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Persistent Current in a Mesoscopic Ring Side-Attached with a Quantum Dot |
| ZHOU Bo1;CHEN Xiong-Wen2; LI Tie1; NIE Yu-Mei1;WU Shao-Quan3 |
| 1School of Mathematics and Physics, Chongqing Institute of Technology, Chongqing 400050
2Department of Physics, College of Huaihua, Huaihua 418008
3Department of Physics, Sichuan Normal University, Chengdu 610066 |
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| Cite this article: |
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ZHOU Bo, CHEN Xiong-Wen, LI Tie et al 2005 Chin. Phys. Lett. 22 2918-2921 |
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Abstract We theoretically investigate properties of the ground state of a closed dot-ring system with a magnetic flux in the Kondo regime by means of a tight-banding Anderson Hamiltonian, using the Slave--Boson mean-field approach. The persistent current shows interesting dependences on the parity and on the size of the system. The signature of Kondo resonance at xik/L=0.15 is expected to be observed experimentally in the future. With the intensity of the coupling tD changes from weak to strong, the properties of the system changes largely, which are different from the in-line one because of the attached dot.
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| Keywords:
72.10.Fk
73.63.Kv
73.63.Nm
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Published: 01 November 2005
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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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73.63.Kv
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(Quantum dots)
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73.63.Nm
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(Quantum wires)
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