Effects of interwell coupling on plasmon modes in symmetric double square quantum well structures
文献类型：期刊论文
| 作者 | Liu, XH ; Wang, XH ; Gu, BY |
| 刊名 | PHYSICAL REVIEW B
 |
| 出版日期 | 2001 |
| 卷号 | 64期号:19 |
| 关键词 | COLLECTIVE MODES ACOUSTIC PLASMON ELECTRON SYSTEMS BILAYER EXCITATIONS TEMPERATURE |
| ISSN号 | 1098-0121 |
| 通讯作者 | Liu, XH: Chinese Acad Sci, Inst Phys, POB 603, Beijing 100080, Peoples R China. |
| 中文摘要 | Using self-consistent-field and linear response theories, we calculate the collective charge-density excitations of modulation-doped GaAs-AlxGa1-xAs double square quantum well structures in which the subband structures are determined self-consistently. We show that the effects of many-body renormalization on the subband energies are profound. We systematically investigate the dependence of the plasmon spectrum on the coupling between the two wells. In the Coulomb coupling regime, the optical and acoustic modes move close to each other when the interwell coupling is decreased. They both approach the intrasubband mode of a single quantum well as the barrier becomes quite wide. When the barrier becomes narrower, tunneling coupling plays an important role. Our numerical results show that the intersubband collective modes strongly depend on the tunneling coupling strength, while the intrasubband mode is insensitive to this tunneling coupling. The evolution of the collective excitation modes with tunneling coupling strength can be clearly observed by decreasing the width or height of the barrier. The behavior of the depolarization shift shows that the dynamical many-body effects become stronger with the increase of the tunneling coupling strength. Hence, the characteristics of the plasmon modes in different tunneling regimes provide a powerful tool for studying many-body effects. |
| 收录类别 | SCI |
| 语种 | 英语 |
| 公开日期 | 2013-09-17 |
| 源URL | [http://ir.iphy.ac.cn/handle/311004/36749]  |
| 专题 | 物理研究所_物理所公开发表论文_物理所公开发表论文_期刊论文 |
| 推荐引用方式 GB/T 7714 | Liu, XH,Wang, XH,Gu, BY. Effects of interwell coupling on plasmon modes in symmetric double square quantum well structures[J]. PHYSICAL REVIEW B,2001,64(19). |
| APA | Liu, XH,Wang, XH,&Gu, BY.(2001).Effects of interwell coupling on plasmon modes in symmetric double square quantum well structures.PHYSICAL REVIEW B,64(19). |
| MLA | Liu, XH,et al."Effects of interwell coupling on plasmon modes in symmetric double square quantum well structures".PHYSICAL REVIEW B 64.19(2001). |
入库方式： OAI收割
来源：物理研究所
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