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arXiv 1601.05342cond-mat.mes-hall
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一维原子线阵列中等离子体激元激发的二维交叉和强耦合

Two-dimensional crossover and strong coupling of plasmon excitations in arrays of one-dimensional atomic wires

Timo Lichtenstein, Julian Aulbach, Jörg Schäfer, Ralph Claessen, Christoph Tegenkamp, Herbert Pfnür

摘要:

利用高能动量分辨电子损失谱(ELS-LEED)结合低能电子衍射(SPA-LEED)和隧道显微镜研究了规则台阶Si(553)和Si(775)表面Au链阵列的集体电子激发.这两个表面都含有一个双链的金原子每个平台。尽管仅沿着导线观察到一维金属性和等离子体激元分散,但二维效应很重要,因为等离子体激元分散明显取决于导线的结构图案和平台宽度。每个平台上的电子密度被调制,如隧道光谱(STS)所示。由等离子体激元色散确定的Si(553)-Au的有效线宽为7.5 μ m,Si(775)-Au的有效线宽为10.2 μ m,与STS数据符合得很好。除了最近邻耦合之外,还可以看到导线之间耦合的明显证据。

英文摘要:

The collective electronic excitations of arrays of Au chains on regularly stepped Si(553) and Si(775) surfaces were studied using electron loss spectroscopy with simultaneous high energy and momentum resolution (ELS-LEED) in combination with low energy electron diffraction (SPA-LEED) and tunneling microscopy. Both surfaces contain a double chain of gold atoms per terrace. Although one-dimensional metallicity and plasmon dispersion is observed only along the wires, two-dimensional effects are important, since plasmon dispersion explicitly depends both on the structural motif of the wires and the terrace width. The electron density on each terrace turns out to be modulated, as seen by tunneling spectroscopy (STS). The effective wire width of 7.5\,Å for Si(553)-Au -- 10.2\,Å for Si(775)-Au -- , determined from plasmon dispersion is in good agreement with STS data. Clear evidence for coupling between wires is seen beyond nearest neighbor coupling.

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