在单元界限中的孔多效应
van der Wiel WG1, De Franceschi S, Fujisawa
1Department of Applied Physics, Delft Institute for Microelectronics and Submicrontechnology, and ERATO Mesoscopic Correlation Project, Delft University of Technology, Post Office Box 5046, 2600 GA Delft, Netherlands. NTT Basic Research Laboratories,
Science (New York, N.Y.)
|September 23, 2000
概括
我们观察到半导体量子点中强烈的康多效应,克服库伦阻塞并达到单元导电. 实验结果与反转-1/2安德森杂质模型的理论预测保持一致.
科学领域:
- 凝聚物质物理学 凝聚物质物理学
- 量子计算是一种量子计算.
- 介面镜物理学的物理
背景情况:
- 康多效应描述了金属中局部磁矩和导电电子之间的相互作用.
- 量子点为研究诸如康多效应之类的量子现象提供了一个可调的平台.
- 了解量子点中的电子道和导电性对于量子技术至关重要.
研究的目的:
- 为了研究半导体量子点中的Kondo效应,在一个小磁场下.
- 为了比较实验发现与理论预测的旋转-1/2安德森杂质模型.
- 探索Kondo量子点对Aharonov-Bohm环中的相连贯性的影响.
主要方法:
- 半导体量子点的制造和表征.
- 在不同磁场下测量电子道导电量.
- 实验中的Kondo温度与理论上的Anderson杂质模型预测的比较.
- 将Kondo量子点集成到Aharonov-Bohm环设置中.
主要成果:
- 在应用磁场的半导体量子点中观察到强烈的Kondo效应.
- 康多效应完全克服了库伦阻塞,导致单元极限导电量.
- 实验中的Kondo温度与理论预测有很好的一致性.
- 在包含Kondo量子点的Aharonov-Bohm环中保持相位相干,具有明显的相位行为.
结论:
- 半导体量子点表现出强大的康多效应,与安德森杂质模型一致.
- 康多效应显著影响量子点中的电子道化和导电.
- 康多量子点可以整合到像阿哈罗诺夫-博姆环这样的中介层结构中,同时保持相位连贯性.
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