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Aharonov--Bohm Oscillations and Fano Resonance of a Coupled Dot-Ring System |
| XIONG Yong-Jian |
| Key Laboratory of Nano Materials of Ningbo and Department of Physics, Ningbo University, Ningbo 315211 |
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| Cite this article: |
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XIONG Yong-Jian 2006 Chin. Phys. Lett. 23 705-707 |
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Abstract We derive an exact expression for the transmission coefficient through an Aharonov--Bohm ring with a side-coupled quantum dot using the scattering-matrix approach. We show a sudden AB phase change by π as the quantum dot is tuned across the resonance. The Aharonov--Bohm oscillation amplitude can be modulated effectively by tuning the quantum dot level. The transmission coefficient has an expression of the generalized Fano form with a complex Fano parameter q in the presence of the Aharonov--Bohm flux.
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| Keywords:
73.63.Kv
73.23.Hk
72.15.Qm
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Published: 01 March 2006
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| PACS: |
73.63.Kv
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(Quantum dots)
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73.23.Hk
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(Coulomb blockade; single-electron tunneling)
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72.15.Qm
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(Scattering mechanisms and Kondo effect)
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