Vertical atomic manipulation with dynamic atomic-force microscopy without tip change via a multi-step mechanism
Vertical atomic manipulation with dynamic atomic-force microscopy without tip change via a multi-step mechanism
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DOI：
10.1038/ncomms5476
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发表时间：
2014-07
影响因子：
16.6
通讯作者：
J. Bamidele;Seung Hwan Lee;Y. Kinoshita;R. Turanský;Y. Naitoh;Y. Li;Y. Sugawara;I. Štich;L. Kantorovich
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文献类型：
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作者：
J. Bamidele;Seung Hwan Lee;Y. Kinoshita;R. Turanský;Y. Naitoh;Y. Li;Y. Sugawara;I. Štich;L. Kantorovich
操纵是非接触原子力显微镜技术最令人兴奋的特征，因为它允许在表面建立纳米结构。通常垂直操作伴随着突如其来的尖端修改，导致对比度的变化。在这里，我们报道了在成像对比度保持不变的情况下，在p(2×1)Cu(110)：O表面上进行垂直操作的低温实验，包括从尖端的提取和沉积。采用一种新的、完全通用的方法对这些结果进行了解释，该方法结合了密度泛函理论计算作为尖端高度的函数来获得势垒，以及动力学蒙特卡罗算法来研究尖端动力学和操纵统计的提取。该模型揭示了一种新的多步操纵机制，该机制结合了超级铜原子在尖端的激活跳跃以及它们在尖端的拖曳和扩散。
Manipulation is the most exciting feature of the non-contact atomic force microscopy technique as it allows building nanostructures on surfaces. Usually vertical manipulations are accompanied by an abrupt tip modification leading to a change of contrast. Here we report on low-temperature experiments demonstrating vertical manipulations of ‘super’-Cu atoms on thep(2 × 1) Cu(110):O surface, both extractions to and depositions from the tip, when the imaging contrast remains the same. These results are rationalized employing a novel and completely general method that combines density functional theory calculations for obtaining energy barriers as a function of tip height and a Kinetic Monte Carlo algorithm for studying the tip dynamics and extraction of manipulation statistics. The model reveals a novel multi-step manipulation mechanism combining activated jumps of ‘super’-Cu atoms to/from the tip with their drag by and diffusion on the tip.