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Experimental signatures of spiky local density of states in quasicrystals

机译:准晶体中尖峰状局部密度的实验特征

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Our recent investigations on the valence electronic structure of the icosahedral Al_(70)Pd_(21)Mn_9 quasicrystals by means of scanning tunneling microscopy and spectroscopy at low temperatures (5 K) have revealed signatures of a spiky local density of states near the Fermi energy. The local tunneling spectra are characterized by narrow peaks and pseudogaps exhibiting typical energy width of 20-50 meV. The spectroscopic features are of very localized nature, with a typical spatial extent of 0.5-1 nm. This observation reanimates the discussion of the nature of the valence electronic states in aperiodic crystals, where Bloch's theorem-fundamental to the band picture in periodic crystals-cannot be applied. We observe that the spiky aspect of the density of states is only present on the nanometer scale. If series of local point spectra recorded over surface areas larger than typically 10 ×10 nm~2 are averaged, the multitude of local features is smeared out and lead to a rather smooth total spectrum.
机译:我们最近在低温(5 K)下通过扫描隧道显微镜和光谱学对二十面体Al_(70)Pd_(21)Mn_9准晶体的价电子结构进行的研究表明,费米能附近的态的局部峰密度高。局部隧穿光谱的特征在于窄峰和伪间隙,其典型的能量宽度为20-50 meV。光谱特征具有非常局部的性质,典型的空间范围为0.5-1 nm。这一观察使对非周期性晶体中价电子态性质的讨论恢复了活力,在该讨论中,无法应用布洛赫定理(对周期晶体中的能带图是基本的)。我们观察到,态密度的尖刻方面仅存在于纳米尺度上。如果对在通常大于10×10 nm〜2的表面积上记录的一系列局部光谱进行平均,则会抹去大量局部特征,从而导致相当平滑的总光谱。

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