Electronic density oscillations in gold atomic chains assembled atom by atom.
Electronic density oscillations in gold atomic chains assembled atom by atom.
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DOI：
10.1103/physrevlett.89.236802
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发表时间：
2002-11
影响因子：
8.6
通讯作者：
T. Wallis;N. Nilius;Wilson Ho
中科院分区：
文献类型：
--
作者：
T. Wallis;N. Nilius;Wilson Ho
通过使用扫描隧道显微镜操纵单个原子，在 NiAl(110) 表面上构建了 2 至 20 个原子长的线性金链。这些链的微分电导 (dI/dV) 图像揭示了能量高于费米能量 1.0 至 2.5 eV 的一维电子密度振荡。这种离域电子结构的起源可以追溯到在单个孤立的金原子上测量到的电子共振的存在。在不同能量下拍摄的 11 个原子链的 dI/dV 图像中波长的变化揭示了有效电子质量为自由电子质量的 0.4+/-0.1 倍。
Linear Au chains two to 20 atoms long were constructed on a NiAl(110) surface via the manipulation of single atoms with a scanning tunneling microscope. Differential conductance (dI/dV) images of these chains reveal one-dimensional electronic density oscillations at energies 1.0 to 2.5 eV above the Fermi energy. The origin of this delocalized electronic structure is traced to the existence of an electronic resonance measured on single, isolated Au atoms. Variations in the wavelength in dI/dV images of an eleven-atom chain taken at different energies revealed an effective electronic mass of 0.4+/-0.1 times the mass of a free-electron.