论文标题
使用两尖扫描隧道显微镜对Green的功能测量进行建模
Modeling Green's functions measurements with two-tip scanning tunneling microscopy
论文作者
论文摘要
具有纳米尺度尖端分离的双尖扫描隧道显微镜具有基于二阶隧道过程的真实和动量空间中的单电子绿色功能。由于信号尺寸极小，这种测量值的实验实现已限于准二维系统。在这里，我们提出了一种替代方法来通过从单个技巧中利用当前电流的相关性来获取此类信息，并提出了一种理论形式主义来描述它。为了评估我们的方法的可行性，我们对$ \ sim $ 25 nm pb纳米群岛进行数值估计，并表明波功能实际上从尖端到尖端延伸，并且信号的依赖于差异性方法中的差异性较大的尖端分离，而不是依靠依靠尖端到TIP电导的方法。
A double-tip scanning tunneling microscope with nanometer scale tip separation has the ability to access the single electron Green's function in real and momentum space based on second order tunneling processes. Experimental realization of such measurements has been limited to quasi-one-dimensional systems due to the extremely small signal size. Here we propose an alternative approach to obtain such information by exploiting the current-current correlations from the individual tips, and present a theoretical formalism to describe it. To assess the feasibility of our approach we make a numerical estimate for a $\sim$ 25 nm Pb nanoisland and show that the wavefunction in fact extends from tip-to-tip and the signal depends less strongly on increased tip separation in the diffusive regime than the one in alternative approaches relying on tip-to-tip conductance.
