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Magnetic flux effects in an Aharonov-Bohm ring with an inserted quantum dot
Luo, HG; Wang, SJ; Jia, CL; Luo, HG , Lanzhou Univ, Dept Modern Phys, Lanzhou 730000, Peoples R China.
2002
发表期刊PHYSICAL REVIEW B
ISSN1098-0121
卷号66期号:23页码:-
摘要The magnetic-flux effects in an Aharonov-Bohm ring with an inserted quantum dot (QD) are investigated in detail. In the present model studied the flux is attached to the coupling between the QD and the ring. Two important subjects are addressed; one the persistent current (PC), and the other the transmission phase shift. It is found that the magnetic flux plays an important role in both the enhancement of the PC and the evolution of the transmission phase shift. At zero temperature one finds that (i) the position of the Kondo resonance (KR) is not sensitive to the flux, and (ii) the width of the KR is, instead, dependent on the flux. The new mechanism for the KR channel is found: when the Fermi level goes across the KR, the PC is strongly enhanced; otherwise, the PC is suppressed. This mechanism provides deep insight into the enhancement and suppression of the PC. On the other hand, both the magnetic flux and the temperature are important features governing the phase evolution through the quantum dot. At high temperature, the phase evolution is dominated by the temperature and acquires pi as passing through each of the Coulomb blockade peaks, while the magnetic flux Phi plays a minor role. On the contrary, at zero or low temperature, the phase evolution is dominated by the magnetic flux; it acquires pi as Phi is about +/-Phi(0)/2 (Phi(0) is flux quantum) and acquires pi/2 as Phi is about zero. Our results are consistent with the experimental observations and other theoretical calculations.
部门归属Lanzhou Univ, Dept Modern Phys, Lanzhou 730000, Peoples R China; Chinese Acad Sci, Inst Theoret Phys, Beijing 100080, Peoples R China
关键词Single-electron Transistor Site Coulomb Repulsion Anderson Model Kondo Resonance Persistent Currents Mesoscopic Ring Equilibrium Transport States Fano
学科领域Physics
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收录类别SCI
WOS记录号WOS:000180279400078
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被引频次:12[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://ir.itp.ac.cn/handle/311006/13390
专题理论物理所1978-2010年知识产出
通讯作者Luo, HG , Lanzhou Univ, Dept Modern Phys, Lanzhou 730000, Peoples R China.
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Luo, HG,Wang, SJ,Jia, CL,et al. Magnetic flux effects in an Aharonov-Bohm ring with an inserted quantum dot[J]. PHYSICAL REVIEW B,2002,66(23):-.
APA Luo, HG,Wang, SJ,Jia, CL,&Luo, HG , Lanzhou Univ, Dept Modern Phys, Lanzhou 730000, Peoples R China..(2002).Magnetic flux effects in an Aharonov-Bohm ring with an inserted quantum dot.PHYSICAL REVIEW B,66(23),-.
MLA Luo, HG,et al."Magnetic flux effects in an Aharonov-Bohm ring with an inserted quantum dot".PHYSICAL REVIEW B 66.23(2002):-.
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