Measuring voltage transients with an ultrafast scanning tunneling microscope

Ultrafast Scanning Tunneling Microscopy

Simulating Scanning Tunneling Microscope

A circuit for measuring the gap voltage of a scanning tunneling microscope on a nanosecond time scale

We demonstrate a new circuit design for fast measurements of the voltage drop across the gap of a scanning tunneling microscope ~STM! based on the simultaneous operation of two different amplifiers. The first is a fast instrumentation amplifier, sensing directly the voltage drop across the tunneling barrier, the second is a medium speed current amplifier with an overall gain of 10 V/A, suitable...

Scanning tunneling microscope for magneto-optical imaging

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Reproducible Fabrication of Scanning Tunneling Microscope Tips

Reproducible fabrication of Scanning Tunneling Microscope tips is carried out following an electrochemical procedure widely reported. Tips are made from 0.5 diameter tungsten wire. Controlling fabrication parameters (immersion in the electrochemical solution, current-voltage ranges, duration of the process, among others) we achieve aspect ratios of 0.68 and tip radii of 330 nm in the best case....