Electron transport of a quantum wire containing a finite-size impurity under terahertz electromagnetic-field illumination
文献类型：期刊论文
| 作者 | G. Zhou ; Y. Li ; F. Cheng ; W. Liao |
| 刊名 | Journal of Applied Physics
 |
| 出版日期 | 2005 |
| 卷号 | 97期号:12 |
| 关键词 | quantized conductance point contacts attractive impurity resistance channel irradiation |
| ISSN号 | 0021-8979 |
| 中文摘要 | We investigate theoretically the electron-transport properties for a semiconductor quantum wire containing a single finite-size attractive impurity under an external terahertz electromagnetic-field illumination in the ballistic limit. Within the effective-mass free-electron approximation, the scattering matrix for the system has been formulated by means of a time-dependent mode matching method. Some interesting properties of the electron transmission for the system have been shown through numerical examples. It is found that in the case of a relatively large field amplitude and a frequency resonant with that corresponding to the difference between the two lowest lateral energy levels in the impurity region, the field-induced intersubband transition dominates the process as it does in the absence of the impurity. Furthermore, there is a steplike structure on the transmission as a function of the incident electron energy. However, in the case of a small field amplitude and nonresonant frequencies, both multiple symmetry Breit-type resonance peaks and asymmetry Fano-type dip lines appear in the electron transmission dependence on the incident energy due to the presence of the impurity and the external field. Therefore, within a certain energy range the transmission as a function of the field frequency and/or field amplitude shows a rich structure. Moreover, the transmission dependence on the strength and size of the impurity is also discussed. Our results suggest that the electron-transport properties of a quantum wire are affected by the interplay effects between the impurity and the applied field. (c) 2005 American Institute of Physics. |
| 原文出处 | |
| 公开日期 | 2012-04-14 |
| 源URL | [http://ir.imr.ac.cn/handle/321006/35290]  |
| 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 | G. Zhou,Y. Li,F. Cheng,et al. Electron transport of a quantum wire containing a finite-size impurity under terahertz electromagnetic-field illumination[J]. Journal of Applied Physics,2005,97(12). |
| APA | G. Zhou,Y. Li,F. Cheng,&W. Liao.(2005).Electron transport of a quantum wire containing a finite-size impurity under terahertz electromagnetic-field illumination.Journal of Applied Physics,97(12). |
| MLA | G. Zhou,et al."Electron transport of a quantum wire containing a finite-size impurity under terahertz electromagnetic-field illumination".Journal of Applied Physics 97.12(2005). |
入库方式： OAI收割
来源：金属研究所
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