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首页> 外文期刊>Physical Review. B, Condensed Matter >Energy dissipation unveils atomic displacement in the noncontact atomic force microscopy imaging of Si(111)-(7 x 7)
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Energy dissipation unveils atomic displacement in the noncontact atomic force microscopy imaging of Si(111)-(7 x 7)

机译：能量耗散揭示了Si（111）-（7 x 7）的非接触原子力显微镜成像中的原子位移

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摘要

The kinetic energy of the oscillating cantilever of noncontact atomic force microscopy (nc-AFM) at room temperature was considerably dissipated over regions between a Si adatom and its neighboring rest atom for Si(111)-(7 x 7) in close proximity to a Si tip on the cantilever. However, nc-AFM topographic images showed no atomic features over those regions, which were the hollow sites of the (7 x 7). This energy dissipation likely originated from displacement of Si adatoms with respect to the tip over the hollow sites, leading to a lateral shift of the adatoms toward the rest atom. This interaction led to hysteresis over each cantilever oscillation cycle; when the tip was retracted, the Si adatom likely returned to its original position. To confirm the atomic processes involved in the force interactions through Si dangling bonds, the Si(111)-(7 x 7) surface was partly terminated with atomic hydrogen (H) and examined by nc-AFM. When the Si adatoms and/or the rest atoms were terminated with H, the hollow sites were not bright (less dissipation) in images of the energy dissipation channels by nc-AFM. The hollow sites acted as metastable sites for Si adatoms in surface diffusion and atom manipulation; thus, the dissipation energy which is saturated on the tip likely corresponds to the difference in the potential energy between the hollow site and the Si adatom site. In this study, we demonstrated the ability of dissipation channels of nc-AFM to enable visualization of the dynamics of atoms and molecules on surfaces, which cannot be revealed by nc-AFM topographic images alone.
机译：在室温下，非接触原子力显微镜（nc-AFM）的振荡悬臂的动能在Si原子与其相邻的静止原子之间的区域Si（111）-（7 x 7）大量散失。硅尖在悬臂上。但是，nc-AFM地形图在那些区域（7 x 7）的空心位置上没有显示原子特征。这种能量耗散可能源于硅原子相对于中空位点上方的尖端发生位移，从而导致原子向剩余原子的横向移动。这种相互作用导致每个悬臂振荡周期的磁滞。当针头缩回时，硅原子可能会回到其原始位置。为了确认参与通过Si悬空键进行力相互作用的原子过程，Si（111）-（7 x 7）表面部分被原子氢（H）终止，并通过nc-AFM检查。当Si原子和/或其余原子被H终止时，通过nc-AFM在能量消散通道的图像中，空心位点不会变亮（消散）。空心位点充当Si原子在表面扩散和原子操纵中的亚稳态位点；因此，在尖端上饱和的耗散能量可能对应于中空位点与Si吸附原子位点之间的势能差。在这项研究中，我们证明了nc-AFM的耗散通道能够可视化表面上原子和分子的动力学，而这仅凭nc-AFM地形图无法揭示。

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  • 来源
    《Physical Review. B, Condensed Matter》 |2018年第11期|115428.1-115428.6|共6页
  • 作者

    Toyoko Arai; Ryo Inamura; Daiki Kura; Masahiko Tomitori;

  • 作者单位

    Natural Science and Technology, Kanazawa University, Kanazawa, Ishikawa 920-1192, Japan;

    Natural Science and Technology, Kanazawa University, Kanazawa, Ishikawa 920-1192, Japan;

    Natural Science and Technology, Kanazawa University, Kanazawa, Ishikawa 920-1192, Japan;

    School of Materials Science, Japan Advanced Institute of Science and Technology, Nomi, Ishikawa 923-1292, Japan;

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