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Related Experiment Video

Updated: Mar 5, 2026

Experimental Methods for Spin- and Angle-Resolved Photoemission Spectroscopy Combined with Polarization-Variable Laser
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Experimental Methods for Spin- and Angle-Resolved Photoemission Spectroscopy Combined with Polarization-Variable Laser

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Spin polarisation with electron Bessel beams.

P Schattschneider1, V Grillo2, D Aubry3

  • 1Institut für Festkörperphysik, Technische Universität Wien, A-1040 Wien, Austria; USTEM, Technische Universität Wien, A-1040 Wien, Austria.

Ultramicroscopy
|March 26, 2017
PubMed
Summary
This summary is machine-generated.

Electron microscopes can act as spin polarizers using Bessel beams. This method shows potential for high polarization, especially at low voltages, offering a new design for spin filters.

Keywords:
CoherenceSpin-orbit coupling

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Area of Science:

  • Physics
  • Materials Science
  • Electron Optics

Background:

  • Electron microscopy is a powerful tool for materials characterization.
  • Spin polarization is crucial for understanding electron behavior in materials.
  • Current spin polarizers have limitations in integration and efficiency.

Purpose of the Study:

  • To investigate the theoretical possibility of using an electron microscope as a spin polarizer.
  • To analyze the spin polarization of a Bessel beam passing through a magnetic objective lens.
  • To evaluate the performance of this method for potential spin filter applications.

Main Methods:

  • Theoretical study of electron spin polarization.
  • Simulation of a Bessel beam interacting with a magnetic objective lens.
  • Analysis of spin polarization dependence on detector size and electron voltage.

Main Results:

  • A Bessel beam passing through a standard magnetic objective lens is intrinsically spin polarized when post-selected on-axis.
  • Spin polarization approaches 100% in the limit of infinitely small detectors.
  • Polarization drops below 10⁻⁴ for standard medium voltage microscope settings.
  • The Figure of Merit improves significantly at extremely low voltages, comparable to Mott detectors.

Conclusions:

  • Electron microscopes can theoretically function as spin polarizers.
  • This intrinsic spin polarization offers a novel approach for developing integrated spin filters.
  • Low-voltage electron microscopy presents a promising avenue for enhanced spin polarization performance.