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Kondo Resonance versus Fano Interference in Double Quantum Dots Coupled to a Two-Lead One-Ring System |
| CHEN Xiong-Wen;SHI Zhen-Gang;CHEN Bao-Ju;SONG Ke-Hui |
| 1Department of Physics and Electronic Information Science, Huaihua University, Huaihua 4180082Research Institute of Information Science, Huaihua University, Huaihua418008 |
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| Cite this article: |
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CHEN Xiong-Wen, SHI Zhen-Gang, CHEN Bao-Ju et al 2007 Chin. Phys. Lett. 24 3225-3228 |
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Abstract We analyse the transport properties of a coupled double quantum dot (DQD) device with one of the dots (QD1) coupled to metallic leads and the other (QD2) embedded in an Aharonov--Bhom (A-B) ring by means of the slave-boson mean-field theory. It is found that in this system, the Kondo resonance and the Fano interference exist simultaneously, the enhancing Kondo effect and the increasing hopping of the QD2-Ring destroy the localized electron state in the QD2 for the QD1-leads, and accordingly, the Fano interference between the DQD-leads and the QD1-leads are suppressed. Under some conditions, the Fano interference can be quenched fully and the single Kondo resonance of the QD1-leads comes into being. Moreover, when the magnetic flux of the A-B ring is zero, the influence of the parity of the A-B ring on the transport properties is very weak, but this influence becomes more obvious with non-zero magnetic flux. Thus this model may be a candidate for future
device applications.
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| Keywords:
72.10.Fk
72.15.Qm
73.23.Ra
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Received: 10 April 2007
Published: 23 October 2007
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| PACS: |
72.10.Fk
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(Scattering by point defects, dislocations, surfaces, and other imperfections (including Kondo effect))
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72.15.Qm
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(Scattering mechanisms and Kondo effect)
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73.23.Ra
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(Persistent currents)
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[1] Hewson A C 1993 The Kondo Problem to Heavy Fermions(Cambridge: Cambridge University Press)
[2] Gordon D G, Shtrikman H, Magder D A et al 1998 Nature 391 156
[3] Kang K and Shin S C 2000 Phys. Rev. Lett. 85 5619
[4] Affleck and Simon P 2001 Phys. Rev. Lett. 86 2854
[5] Bing D et al 2004 con-mat/0405538
[6] Martinek J, Utsumi Y and Imamura H te al 2003 Phys. Rev.Lett. 91 127203
[7] Cronenwett S, Oosterkamp T H and Kouwenhoven L P 1998 Science 281 540
[8] Zhou G H and Li Y 2005 J. Phys: Condens. Matter 17 6663 de Guevara M L L, Claro F and Orellana P A 2003 Phys. Rev. B 67 195335
[9] Johnson A C, Marcus C M and Hanson M P et al 2004 Phy. Rev.Lett. 93 106803
[10] Golub A and Avishai Y 2004 Phys. Rev. B 69 165325
[11] Tae-Suk K and Hershfield S 2001 Phys. Rev. B 63 245326
[12] Wu B H, Cao J C and Kang-Hun Ahn 2005 Phys. Rev. B 72 165313
[13] Zhou B, Wu S Q and Sun W L et al 2004 Chin. Phys. 13225 Wu S Q, Wang S J and Sun W L et al 2004 Chin. Phys. 13 510
[14] Chen X W, Wu S Q and Wang P et al 2004 Chin. Phys. Lett. 21 911 |
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