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Related Experiment Video

Updated: Jul 4, 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

Tip-modulation scanned gate microscopy.

Neil R Wilson¹, David H Cobden

¹Department of Physics, University of Warwick, Coventry, CV4 7AL, UK. Neil.Wilson@warwick.ac.uk

|June 28, 2008

Summary

We developed tip-modulation scanned gate microscopy (tmSGM) for clearer imaging. This new technique enhances sensitivity and resolution while removing background noise in scanned gate microscopy (SGM) images.

Area of Science:

Nanoscience
Materials Science
Surface Science

Background:

Scanned gate microscopy (SGM) is a technique used to image sample conductance.
Conventional SGM suffers from limitations in sensitivity, resolution, and nonlocal background noise.
These limitations hinder detailed analysis of nanoscale electronic properties.

Purpose of the Study:

To introduce a novel technique, tip-modulation SGM (tmSGM), that overcomes the limitations of conventional SGM.
To improve the sensitivity and resolution of SGM.
To eliminate the nonlocal background in SGM images.

Main Methods:

The new technique, tmSGM, involves oscillating the biased atomic force microscope tip.
Sample conductance is measured by detecting the induced oscillation.

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This method was applied to single-walled carbon nanotube network devices.

Main Results:

tmSGM provides significantly improved sensitivity and resolution compared to conventional SGM.
The technique effectively eliminates nonlocal background noise.
Sharp, low-noise, and background-free images of single-walled carbon nanotube networks were obtained.

Conclusions:

Tip-modulation SGM (tmSGM) is a superior method for imaging nanoscale electronic properties.
This technique offers enhanced imaging capabilities for materials like carbon nanotubes.
tmSGM opens new possibilities for high-resolution nanoscale characterization.