| Kondo Resonance versus Fano Interference in Double Quantum Dots Coupled to a Two-Lead One-Ring System |
| |
| 作者姓名： | 谌雄文 施振刚 谌宝菊 宋克慧 |
| |
| 作者单位： | [1]Department of Physics and Electronic Information Science, Huaihua University, Huaihua 418008 [2]Research Institute of Information Science, Huaihua University, Huaihua 418008 |
| |
| 基金项目： | Supported by the Natural Science Foundation of Hunan Province under Grant No 06jj50014, the Key Project Foundation of the Education Commission of Hunan Province under Grant No 06A055. and the Scientific Research Foundation of Huaihua University. |
| |
| 摘 要： | 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 slaveboson 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.
|
| 关 键 词： | 共振 干扰因素 双量子点 量子学 |
| 收稿时间： | 2007-04-10 |
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.Kondo Resonance versus Fano Interference in Double Quantum Dots Coupled to a Two-Lead One-Ring System[J].Chinese Physics Letters,2007,24(11):3225-3228. |
| |
| Authors: | CHEN Xiong-Wen SHI Zhen-Gang CHEN Bao-Ju SONG Ke-Hui |
| |
| Affiliation: | Department of Physics and Electronic Information Science, Huaihua University, Huaihua 418008Research Institute of Information Science, Huaihua University, Huaihua418008 |
| |
| 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 futuredevice applications. |
| |
| Keywords: | 72 10 Fk 72 15 Qm 73 23 Ra |
| 本文献已被 维普 等数据库收录！ |
| 点击此处可从《中国物理快报》浏览原始摘要信息 |
|
点击此处可从《中国物理快报》下载免费的PDF全文 |
|
