吸附覆盖层中孤子超结构的AFM耗散拓扑
AFM Dissipation Topography of Soliton Superstructures in Adsorbed Overlayers
摘要：
在原子力显微镜中，甚至复杂的表面超结构的纳米级力的形貌提取通过改变振动频率的扫描尖端。最近，通过绘制（x，y）相关的尖端阻尼图，已经证明了具有类似或甚至更好对比度的替代耗散拓扑结构，但详细的阻尼机制仍然未知。在这里，我们确定了两种不同的尖端耗散机制：局部机械柔软性和滞后。最近的数据的启发，我们描述了他们在一个一维模型的莫尔无公度覆盖层的上层结构。在“孤立子”缺陷处的局部软度产生耗散对比度，其可以比相应的密度或光密度对比度大得多。然而，在实际的低振动频率，一个更强大和更有效的耗散是由尖端引起的孤子的非线性跳跃，自然发展的双稳态和滞后。该机制的签名提出了实验鉴定。
英文摘要：
In the atomic force microscope, the nanoscale force topography of even complex surface superstructures is extracted by the changing vibration frequency of a scanning tip. An alternative dissipation topography with similar or even better contrast has been demonstrated recently by mapping the (x,y)-dependent tip damping but the detailed damping mechanism is still unknown. Here we identify two different tip dissipation mechanisms: local mechanical softness and hysteresis. Motivated by recent data, we describe both of them in a onedimensional model of Moire' superstructures of incommensurate overlayers. Local softness at "soliton" defects yields a dissipation contrast that can be much larger than the corresponding density or corrugation contrast. At realistically low vibration frequencies, however, a much stronger and more effective dissipation is caused by the tip-induced nonlinear jumping of the soliton, naturally developing bistability and hysteresis. Signatures of this mechanism are proposed for experimental identification.
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