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arXiv 1302.6522cond-mat.mes-hallphysics.ins-det
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时间分辨率为120 ps的多功能扫描隧道显微镜

Versatile scanning tunneling microscopy with 120ps time resolution

Christian Saunus, Jan Raphael Bindel, Marco Pratzer, Markus Morgenstern

摘要:

我们描述了一个完全超高真空兼容的扫描隧道显微镜(STM)的射频信号优化。它包括适用于高频布线的现场可更换尖端和标准样品架,可用于STM通常研究的所有样品。我们证明了120 ps的时间分辨率使用的非线性I(V)-高度取向的热解石墨表面的特性。我们提供了原子分辨图像的脉冲模式相关的一个空间变化的非线性的局部态密度的样品,从而证明了可能的空间分辨率的仪器在脉冲模式。噪声的分析表明,50 pA的隧道结的变化是动态检测在120 ps的时间分辨率。

英文摘要:

We describe a fully ultra-high vacuum compatible scanning tunneling microscope (STM) optimized for radio-frequency signals. It includes in-situ exchangeable tips adapted to high frequency cabling and a standard sample holder, which offer access to the whole range of samples typically investigated by STM. We demonstrate a time resolution of 120 ps using the nonlinear I(V)-characteristic of the surface of highly oriented pyrolithic graphite. We provide atomically resolved images in pulse mode related to a spatially varying nonlinearity of the local density of states of the sample, thus, demonstrating the possible spatial resolution of the instrument in pulse mode. Analysis of the noise reveals that changes in the tunneling junction of 50 pA are dynamically detectable at 120 ps time resolution.

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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