Effects of shape and magnetic field on the optical properties of wurtzite quantum rods
文献类型：期刊论文
| 作者 | Zhang XW ; Xia JB |
| 刊名 | physical review b
 |
| 出版日期 | 2005 |
| 卷号 | 72期号:20页码:art.no.205314 |
| 关键词 | COLLOIDAL SEMICONDUCTOR NANOCRYSTALS |
| ISSN号 | 1098-0121 |
| 通讯作者 | zhang, xw, ccast, world lab, pob 8730, beijing 100080, peoples r china. |
| 中文摘要 | the optical properties of quantum rods in the absence and presence of the magnetic field are studied in the framework of effective-mass envelope function theory. the two-dimensional (2d) and 1d transition dipoles of wurtzite quantum rods are investigated. it is found that the transition dipoles change from 2d to 1d as the aspect ratio of the ellipsoid increases, in agreement with the experimental results. the linear polarization factors of optical transitions of quantum rods with critical aspect ratio are zero at every orientation of the wave propagation. so quantum rods with critical aspect ratio have isotropic transition dipoles. due to the 2d or 1d transition dipoles, the linear polarization factors of optical transitions of quantum rods change from negative or positive values to zero as the orientation of the wave propagation changes from the x axis of the crystal structure to the z axis, in agreement with the experimental results. under magnetic field applied along the z axis of the crystal structure, the negative linear polarization factors in the 2d transition dipole case decrease as the magnetic field increases, while under magnetic field applied along the x axis, the negative linear polarization factors increase as the magnetic field increases. the antisymmetric hamiltonian is very important to these effects of the magnetic field. it is found that quantum rods with a given radius at a given temperature have dark excitons in a range of aspect ratio. the dimensions along the x, y axes of the crystal structure play opposite roles to the dimension along the z axis on the dark exciton phenomenon. dark excitons become bright under appropriate magnetic field. |
| 学科主题 | 半导体物理 |
| 收录类别 | SCI |
| 语种 | 英语 |
| 公开日期 | 2010-03-17 |
| 源URL | [http://ir.semi.ac.cn/handle/172111/8386]  |
| 专题 | 半导体研究所_中国科学院半导体研究所（2009年前） |
| 推荐引用方式 GB/T 7714 | Zhang XW,Xia JB. Effects of shape and magnetic field on the optical properties of wurtzite quantum rods[J]. physical review b,2005,72(20):art.no.205314. |
| APA | Zhang XW,&Xia JB.(2005).Effects of shape and magnetic field on the optical properties of wurtzite quantum rods.physical review b,72(20),art.no.205314. |
| MLA | Zhang XW,et al."Effects of shape and magnetic field on the optical properties of wurtzite quantum rods".physical review b 72.20(2005):art.no.205314. |
入库方式： OAI收割
来源：半导体研究所
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