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Related Experiment Video

Updated: Jun 27, 2026

All-electronic Nanosecond-resolved Scanning Tunneling Microscopy: Facilitating the Investigation of Single Dopant Charge Dynamics

All-electronic Nanosecond-resolved Scanning Tunneling Microscopy: Facilitating the Investigation of Single Dopant Charge Dynamics

Published on: January 19, 2018

Local potentiometry using a multiprobe scanning tunneling microscope.

A Bannani¹, C A Bobisch, R Möller

¹Department of Physics, Center for Nanointegration Duisburg-Essen, University of Duisburg-Essen, 47048 Duisburg, Germany. amin.bannani@uni-due.de

The Review of Scientific Instruments

|December 3, 2008

Summary

This summary is machine-generated.

Scanning tunneling potentiometry (STP) enables nanometer-scale conductance analysis of thin films. This study demonstrates STP using a four-tip system to map potential variations on Bi films and Si-Ag surfaces.

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All-electronic Nanosecond-resolved Scanning Tunneling Microscopy: Facilitating the Investigation of Single Dopant Charge Dynamics

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Area of Science:

Surface science
Nanotechnology
Condensed matter physics

Background:

Scanning tunneling potentiometry (STP) offers high lateral resolution for analyzing electrical conductance.
Characterizing potential distribution in thin films is crucial for understanding electronic properties.

Purpose of the Study:

To demonstrate the application of a commercial ultrahigh vacuum multiprobe system for STP experiments.
To analyze the potential distribution and conductance in thin conducting layers with nanometer precision.

Main Methods:

Utilizing a four-tip scanning tunneling potentiometry setup in an ultrahigh vacuum environment.
Applying lateral current with two tips and simultaneously measuring topography and potential distribution with a third tip.
Employing a fourth tip for enhanced signal-to-noise ratio by providing a reference potential.

Main Results:

Observed near-constant potential gradients and distinct potential drops at Bi-domain boundaries for epitaxial (111) Bi films on Si(100).
Precisely resolved potential variations at individual monoatomic steps on the Si(111)(3 x 3)-Ag superstructure surface.

Conclusions:

The four-tip STP system is effective for detailed nanoscale electrical characterization of thin films.
STP reveals localized electronic phenomena at domain boundaries and step edges in nanostructured materials.