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Calibration of Vector Network Analyzer for Measurements in Radio Frequency Propagation Channels
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An Atomic-Scale Vector Network Analyzer.

Susanne Baumann1, Gregory McMurtrie1, Max Hänze1,2

  • 1Institute for Functional Matter and Quantum Technologies, University of Stuttgart, 70569, Stuttgart, Germany.

Small Methods
|February 21, 2024
PubMed
Summary
This summary is machine-generated.

Researchers developed atomic-scale vector network analyzer (VNA) capabilities using a scanning tunneling microscope. This technique quantitatively characterizes individual magnetic atoms

Keywords:
atomic‐scalephase‐resolved microwave spectroscopyscanning tunneling microscopyvector network analyzer

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Area of Science:

  • Condensed Matter Physics
  • Nanotechnology
  • Quantum Electronics

Background:

  • Electronic devices are shrinking to atomic scales, operating at GHz frequencies.
  • Conventional test equipment like vector network analyzers (VNAs) struggle to keep pace with atomic-scale device performance.

Purpose of the Study:

  • To implement VNA capabilities at the atomic scale using a scanning tunneling microscope (STM).
  • To exploit nonlinearities in atomic and nanostructure voltage-current characteristics for high-resolution microwave spectroscopy.
  • To enable quantitative characterization of atomic-scale electronic properties at GHz frequencies.

Main Methods:

  • Utilizing a scanning tunneling microscope (STM) for atomic-scale measurements.
  • Employing phase-resolved microwave spectroscopy at GHz frequencies.
  • Analyzing nonlinearities in voltage-current characteristics of atoms and nanostructures.
  • Performing accurate de-embedding of transmission lines and applying distortion-corrected waveforms within the tunnel junction.

Main Results:

  • Achieved VNA capabilities on the atomic scale.
  • Determined amplitude and phase response up to 9.3 GHz with unprecedented spatial resolution.
  • Quantitatively characterized the complex-valued admittance of individual magnetic iron atoms.
  • Observed a lowpass response in iron atoms with a magnetic-field-tunable cutoff frequency.

Conclusions:

  • The developed atomic-scale VNA technique enables precise characterization of nanoscale electronic components.
  • This method provides new insights into the GHz frequency behavior of individual magnetic atoms.
  • The magnetic-field tunability of the cutoff frequency opens avenues for novel spintronic devices.