300 K下Co纳米岛在MgO/Mo（100）面上的Gundlach振荡和库仑阻塞
Gundlach oscillations and Coulomb blockade of Co nano-islands on MgO/Mo(100) investigated by scanning tunneling spectroscopy at 300 K
摘要：
用扫描隧道显微镜和光谱研究了Mo（100）衬底上厚度达12 ML的MgO超薄薄膜。MgO膜内的功函数的空间变化映射的场发射共振态（冈拉克振荡）使用dz/dU光谱。我们发现圆形斑点显着降低功函数（Δ Phi = 0.6 eV），这是分配给带电缺陷内的MgO膜。在MgO膜的顶部沉积了小的Co团簇，平均接触面积为4 nm^2。这些岛在室温下的dI/dU谱中表现出库仑振荡。与正统理论的一致性很好的实现显示的背景电荷Q_0的岛屿在不同的位置，这是根据由冈拉克振荡确定的功函数的差异。
英文摘要：
Ultrathin MgO films on Mo(100) with a thickness up to 12 ML are studied by scanning tunneling microscopy and spectroscopy at room temperature. The spatial variation of the work function within the MgO film is mapped by field emission resonance states (Gundlach oscillations) using dz/dU spectroscopy. We found circular spots with significantly reduced work function (DeltaPhi=0.6 eV), which are assigned to charged defects within the MgO film. On top of the MgO films, small Co cluster are deposited with an average contact area of 4 nm^2. These islands exhibit Coulomb oscillations in dI/dU spectra at room temperature. Good agreement with orthodox theory is achieved showing variations of the background charge Q_0 for islands at different positions, which are in accordance with the work function differences determined by the Gundlach oscillations.
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