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	Impurity-modulated electron properties in a double-quantum-dot Aharonov-Bohm ring
	S. Zhang ; H. Li ; W. J. Gong ; G. Z. Wei
刊名	Journal of Applied Physics
	2011
卷号	109期号:1
关键词	transport resonances amplifiers coherence islands systems
ISSN号	0021-8979
中文摘要	The impurity-modulated electron transport properties in a double quantum dot (QD) Aharonov-Bohm ring are theoretically studied, by considering impurities locally and nonlocally coupled to the QDs in the ring arms, respectively. It is found that the impurities influence the electron transport in a nontrivial way: in the case of zero magnetic flux, a single-level impurity leads to the appearance of Fano line shapes in the conductance spectra, and the positions of Fano antiresonances are determined by both the impurity-QD couplings and the QD levels separated from the Fermi level; whereas when a magnetic flux is introduced with the phase factor phi=pi the Breit-Wigner line shapes appear in the conductance curves. Compared with the local-impurity case, nonlocal impurities alter the conductance period versus the magnetic flux. In addition, when many-body effect is considered within the second-order approximation, we find the important role of the Coulomb interaction in modifying the electron transport. (C) 2011 American Institute of Physics. [doi: 10.1063/1.3530842]
原文出处	://WOS:000286219300071
公开日期	2012-04-13
内容类型	期刊论文
源URL	[http://210.72.142.130/handle/321006/30909]
专题	金属研究所_中国科学院金属研究所
推荐引用方式 GB/T 7714	S. Zhang,H. Li,W. J. Gong,et al. Impurity-modulated electron properties in a double-quantum-dot Aharonov-Bohm ring[J]. Journal of Applied Physics,2011,109(1).
APA	S. Zhang,H. Li,W. J. Gong,&G. Z. Wei.(2011).Impurity-modulated electron properties in a double-quantum-dot Aharonov-Bohm ring.Journal of Applied Physics,109(1).
MLA	S. Zhang,et al."Impurity-modulated electron properties in a double-quantum-dot Aharonov-Bohm ring".Journal of Applied Physics 109.1(2011).

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