图 书 馆
量子点接触中磁性杂质的形成Magnetic impurity formation in quantum point contacts |
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| 课程网址: | http://videolectures.net/slonano07_rejec_mif/ |
| 主讲教师: | Tomaž Rejec |
| 开课单位: | 卢布尔雅那大学 |
| 开课时间: | 2008-01-18 |
| 课程语种: | 英语 |
| 中文简介: |  |
| 课程简介: | A quantum point contact (QPC), a narrow region separating two wider electron reservoirs, is the standard building block of sub-micron devices, such as quantum dots - small boxes of electrons, and qubits - the proposed basic elements of quantum computers. As a function of its width, the conductance through a QPC changes in integer steps of G0 = 2e2/h, signalling the quantization of its transverse modes. Such measurements also reveal an additional shoulder at a value around 0.7 × G0 which has become known as the 0.7 anomaly. Recently it has been suggested that this phenomenon can be explained if one invokes the existence of a magnetic impurity in the QPC at low densities. Here we report on our extensive density functional calculations that reveal the formation of an electronic state with a spin-1/2 magnetic moment in the channel as the density increases above pinch-off, under very general conditions. |
| 关 键 词: | 量子点接触; 电子储存器; 标准构建块 |
| 课程来源: | 视频讲座网 |
| 最后编审: | 2019-09-21：cwx |
| 阅读次数: | 62 |