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Multi-tip scanning tunneling microscopy (STM) enables nanoscale charge transport measurements, acting as a nanoscale multimeter. This review details performing these measurements and analyzing data for insights into nanoelectronic devices and materials.

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Area of Science:

  • Nanoscience and nanotechnology
  • Condensed matter physics
  • Surface science

Background:

  • Scanning tunneling microscopy (STM) has evolved from imaging to detailed nanoscale spectroscopy.
  • Multi-tip STM represents a significant advancement, enabling precise charge transport measurements at the nanoscale.
  • This technique functions as a 'multimeter at the nanoscale,' expanding the capabilities of traditional STM.

Purpose of the Study:

  • To review the methodologies for performing multi-tip STM measurements.
  • To present data analysis techniques for gaining insights into nanoscale charge transport.
  • To discuss the practical aspects, electronics, and tip properties crucial for multi-tip STM.

Main Methods:

  • Detailed four-point measurements at varying distances.
  • Acquisition of nanoscale potential maps on current-carrying nanostructures.
  • Measurement of current-voltage (I-V) curves for nanoelectronic devices.
  • Development of methods for tip approach to nanostructures on insulating substrates.
  • Extraction of conductivity/resistivity for mixed 2D/3D systems.
  • Measurement of conductivity in 2D sheets.
  • Implementation of scanning tunneling potentiometry with multi-tip setups.

Main Results:

  • Demonstration of multi-tip STM's capability for diverse nanoscale charge transport analyses.
  • Methods for analyzing complex transport phenomena, including contact resistances and tip-sample interactions.
  • Successful application to freestanding vapor-liquid-solid grown nanowires.
  • Extraction of electrical properties from various nanoscale systems.

Conclusions:

  • Multi-tip STM is a powerful technique for detailed nanoscale charge transport characterization.
  • The review provides a comprehensive guide to performing and analyzing multi-tip STM experiments.
  • Understanding and overcoming challenges like contact resistance and tip influence are key to accurate measurements.