论文标题
用于扫描隧道显微镜的简化反馈控制系统
Simplified feedback control system for Scanning Tunneling Microscopy
论文作者
论文摘要
扫描隧道显微镜（STM）是可用于研究和操纵纳米级物质的最重要的扫描探针工具之一。在STM中，将尖端扫描在表面的顶部，分开几个。通常，通过作用于压电传感器上的反馈机制修改尖端顶端和表面之间的距离，通过修改尖端和表面之间的距离保持恒定。这产生了表面电子特性的非常详细的图像。反馈机制几乎总是使用与用户计算机分开的数字处理电路制成的。在这里，我们使用USB端口使用计算机和数据采集来讨论另一种方法。我们发现它允许在低温温度下对表面的成功超低噪声研究。我们在不同的化合物，II型Weyl半学（WTE $ _2 $）上显示了结果，一种准二维二甲基元素超导体（2H-NBSE $ _2 $），一种磁性Weyl semimetal（CO $ _3 $ _3 $ sn $ sn $ _2 $ _2 $ _2 $ _2 $ _2 $）和Ironic pnict pnict pnict pnict pnict suppercorce fore supercordore（Fese）。
A Scanning Tunneling Microscope (STM) is one of the most important scanning probe tools available to study and manipulate matter at the nanoscale. In a STM, a tip is scanned on top of a surface with a separation of a few Å. Often, the tunneling current between tip and sample is maintained constant by modifying the distance between the tip apex and the surface through a feedback mechanism acting on a piezoelectric transducer. This produces very detailed images of the electronic properties of the surface. The feedback mechanism is nearly always made using a digital processing circuit separate from the user computer. Here we discuss another approach, using a computer and data acquisition through the USB port. We find that it allows succesful ultra low noise studies of surfaces at cryogenic temperatures. We show results on different compounds, a type II Weyl semimetal (WTe$_2$), a quasi two-dimensional dichalcogenide superconductor (2H-NbSe$_2$), a magnetic Weyl semimetal (Co$_3$Sn$_2$S$_2$) and an iron pnictide superconductor (FeSe).
