Impurity-modulated electron properties in a double-quantum-dot Aharonov-Bohm ring

IMR OpenIR

	Impurity-modulated electron properties in a double-quantum-dot Aharonov-Bohm ring
	S. Zhang; H. Li; W. J. Gong; G. Z. Wei
	2011
发表期刊	Journal of Applied Physics
ISSN	0021-8979
卷号	109 期号:1
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]
部门归属	[zhang, sha; li, hui; gong, wei-jiang; wei, guo-zhu] northeastern univ, coll sci, shenyang 110819, peoples r china. [gong, wei-jiang; wei, guo-zhu] chinese acad sci, int ctr mat phys, shenyang 110016, peoples r china.;zhang, s (reprint author), northeastern univ, coll sci, shenyang 110819, peoples r china;weijianggong@gmail.com
关键词	Transport Resonances Amplifiers Coherence Islands Systems
URL	查看原文
WOS记录号	WOS:000286219300071
引用统计	被引频次：1[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/30909
专题	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).