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
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
关键词 ：
73.63.Kv ,
73.23.Hk ,
72.15.Qm
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.
Key words ：
73.63.Kv
73.23.Hk
72.15.Qm
出版日期: 2006-03-01
:
73.63.Kv
(Quantum dots)
73.23.Hk
(Coulomb blockade; single-electron tunneling)
72.15.Qm
(Scattering mechanisms and Kondo effect)
引用本文:
XIONG Yong-Jian. Aharonov--Bohm Oscillations and Fano Resonance of a Coupled Dot-Ring System[J]. 中国物理快报, 2006, 23(3): 705-707.
链接本文:
https://cpl.iphy.ac.cn/CN/
或
https://cpl.iphy.ac.cn/CN/Y2006/V23/I3/705
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2006, Vol. 23 
