A scanning tunneling microscope (STM) combines unique capabilities in imaging and spectroscopy with atomic precision, and it can obtain energy-resolved spectroscopic data with atomic resolution. In this paper, we utilize a recently proposed modification to the STM feedback control loop to acquire high quality ${\mathrm{d}}^{2}I/{\mathrm{d}V}^2$ images. We have developed a constant differential conductance imaging method by closing the STM feedback loop with a high precision $\mathrm{d}I/\mathrm{d}V$ measurement. In this mode, the tip’s vertical position is adjusted so as to keep the differential conductance constant during raster scanning of the surface. Based on this imaging mode, we propose a new technique to acquire fast and reliable scanning tunneling spectroscopy (STS) data simultaneously with the imaging.

中文翻译：

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扫描隧道光谱的超快方法

扫描隧道显微镜 (STM) 将成像和光谱学的独特功能与原子精度相结合，可以获得具有原子分辨率的能量分辨光谱数据。在本文中，我们利用最近提出的对 STM 反馈控制回路的修改来获得高质量的${\mathrm{d}}^2\mathrm{一世}/{\mathrm{d}伏}^2$图片。我们开发了一种通过高精度闭合 STM 反馈回路的恒定微分电导成像方法$\mathrm{d}\mathrm{一世}/\mathrm{d}伏$测量。在这种模式下，调整尖端的垂直位置，以便在表面光栅扫描期间保持微分电导恒定。基于这种成像模式，我们提出了一种新技术，可以在成像的同时获取快速可靠的扫描隧道光谱 (STS) 数据。