Imaging and moving a xenon atom on a copper (110) surface with the tip of a scanning tunneling microscope: A theoretical study.
Imaging and moving a xenon atom on a copper (110) surface with the tip of a scanning tunneling microscope: A theoretical study.
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使用扫描隧道显微镜的尖端对铜 (110) 表面上的氙原子进行成像和移动：一项理论研究。
DOI：
10.1103/physrevb.47.7454
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发表时间：
1993
期刊：
影响因子：
--
通讯作者：
Sautet
中科院分区：
文献类型：
--
作者：
Bouju;Joachim;Girard;Sautet
讨论了扫描隧道显微镜（STM）针尖引起的氙原子在Cu（110）表面的滑动。首先，考虑Born-Mayer排斥和货车德瓦耳斯相互作用，计算了Cu（110）表面上无针尖时的稳定高度和横向位置.使用这种几何结构，然后使用STM-ESQC技术计算Xe原子的恒流STM图像。当I=1 nA，V=10 mV时，凸点为1.7AA，与实验结果吻合较好.还讨论了针尖顶端下的原子稳定性随针尖到衬底距离的变化。在每个尖端高度处，计算隧道电流强度。由计算结果导出了针尖移动双原子所需的阈值隧穿电阻，与实验值符合得很好。有人认为，滑动的过程是由于捕获的货车范德华力的尖端尖端创建的良好的原子。当尖端扫描时，该陷印沿着（1\ifmmode\bar\else\textasciimacron\fi{}10）行移动。
The sliding of a xenon atom on a Cu(110) surface caused by a scanning tunneling microscope (STM) tip is discussed. Initially, the stable height and lateral position of a Xe atom on Cu(110) in the absence of the tip is calculated by considering Born-Mayer repulsive and van der Waals interactions. Using this geometry, a constant-current STM image of the Xe atom is then calculated using the STM-ESQC technique. For I=1 nA and V=10 mV, a bump of 1.7 \AA{} is found, which is in good agreement with experiments. The stability of the Xe atom under the tip apex as a function of the tip to substrate distance is also discussed. At each tip height, the tunnel current intensity is calculated. The threshold tunnel resistance required to move a Xe atom with the tip is deduced from these calculations and is in good agreement with the experimental one. It is argued that the sliding process is due to the trapping of the Xe atom in a van der Waals well created by the tip apex. This trap is moved along the (1\ifmmode\bar\else\textasciimacron\fi{}10) rows as the tip scans.