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arXiv 1712.09031cond-mat.mes-hall
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GaAs/AlGaAs异质结中按需单电子源超热电子的LO声子发射率

LO-phonon emission rate of hot electrons from an on-demand single-electron source in a GaAs/AlGaAs heterostructure

N. Johnson, C. Emary, S. Ryu, H. -S. Sim, P. See, J. D. Fletcher, J. P. Griffiths, G. A. C. Jones, I. Farrer, D. A. Ritchie, M. Pepper, T. J. B. M. Janssen, M. Kataoka

摘要:

利用最近发展起来的具有1 ps时间分辨率的飞行时间测量技术和电子能谱技术,我们发展了一种测量超热电子沿量子霍尔条耗尽边缘运动的光-声子发射率的方法。实验结果的比较,一个单粒子模型意味着主要的散射机制涉及到两个步骤的过程,通过内朗道能级跃迁。我们表明这种散射可以通过控制边缘电位分布来抑制,并且可以实现> 1 mm的散射长度,从而允许将该系统用于可扩展的单电子器件应用。

英文摘要:

Using a recently-developed time-of-flight measurement technique with 1 ps time resolution and electron-energy spectroscopy, we developed a method to measure the longitudinal-optical-phonon emission rate of hot electrons travelling along a depleted edge of a quantum Hall bar. A comparison of the experimental results to a single-particle model implies that the main scattering mechanism involves a two-step process via intra-Landau-level transition. We show this scattering can be suppressed by controlling the edge potential profile, and a scattering length > 1 mm can be achieved, allowing the use of this system for scalable single-electron device applications.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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