Current-induced nuclear spin depolarization at Landau level filling factor nu=1/2
文献类型：期刊论文
| 作者 | Li, YQ ; Umansky, V ; von Klitzing, K ; Smet, JH |
| 刊名 | PHYSICAL REVIEW B
 |
| 出版日期 | 2012 |
| 卷号 | 86期号:11 |
| 关键词 | 2-DIMENSIONAL ELECTRON-GAS HALL-EFFECT REGIME GAAS-ALXGA1-XAS HETEROSTRUCTURES COMPOSITE FERMIONS QUANTUM-WELLS POLARIZATION NMR TEMPERATURES RESONANCE DYNAMICS |
| ISSN号 | 1098-0121 |
| 通讯作者 | Li, YQ: Max Planck Inst Solid State Res, Heisenbergstr 1, D-70569 Stuttgart, Germany. |
| 中文摘要 | In this work, we demonstrate that significant changes in electron temperature and nuclear spin polarization can be created by applying an electric current in a two-dimensional electron system at Landau level filling factor nu = 1/2. The current induced effects on nuclear spins can be attributed to electron heating and the efficient coupling between the nuclear and electron spin systems at nu = 1/2. The electron temperature, elevated by the current, can be measured with a thermometer based on the measurement of the nuclear spin relaxation rate. The electron temperature is found to be proportional to the square root of the current density at nu = 1/2. Electron spin transitions at nu = 2/3 and 1/2 are utilized for the measurement of the current induced changes in nuclear spin polarization. Consistent results are obtained from these two different methods of nuclear magnetometry. The finite thickness of the electron wave function is found to be important for evaluation of the nuclear spin polarization even in a narrow quantum well. The nuclear spin polarization follows a Curie law dependence on the electron temperature. This work also allows us to evaluate the electron g factor in high magnetic fields as well as the polarization mass of composite fermions. |
| 收录类别 | SCI |
| 资助信息 | National Science Foundation of China [10974240, 91121003]; National Basic Research Program of China [2009CB929101, 2012CB921703]; Hundred Talents Program of the Chinese Academy of Sciences; German Ministry of Science and Education; German Israeli Foundation |
| 语种 | 英语 |
| 公开日期 | 2013-09-17 |
| 源URL | [http://ir.iphy.ac.cn/handle/311004/35582]  |
| 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 | Li, YQ,Umansky, V,von Klitzing, K,et al. Current-induced nuclear spin depolarization at Landau level filling factor nu=1/2[J]. PHYSICAL REVIEW B,2012,86(11). |
| APA | Li, YQ,Umansky, V,von Klitzing, K,&Smet, JH.(2012).Current-induced nuclear spin depolarization at Landau level filling factor nu=1/2.PHYSICAL REVIEW B,86(11). |
| MLA | Li, YQ,et al."Current-induced nuclear spin depolarization at Landau level filling factor nu=1/2".PHYSICAL REVIEW B 86.11(2012). |
入库方式： OAI收割
来源：物理研究所
浏览0
下载0
收藏0
其他版本
除非特别说明，本系统中所有内容都受版权保护，并保留所有权利。