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Updated: Mar 3, 2026

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

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On-Chip Laser-Driven Free-Electron Spin Polarizer.

Clarisse Woodahl¹, Melanie Murillo¹, Charles Roques-Carmes¹

¹Stanford University, E. L. Ginzton Laboratory, Stanford, California 94305, USA.

Physical Review Letters

|March 1, 2026

Summary

This summary is machine-generated.

Researchers developed a compact integrated photonics chip to generate spin-polarized electrons using laser-driven fields. This method enables nanoscale studies of spin-dependent phenomena with high spin expectation values.

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Area of Science:

Physics
Materials Science
Nanotechnology

Background:

Spin-polarized electrons are crucial for investigating nanoscale spin-dependent phenomena.
Current methods for generating spin-polarized electrons can be complex and lack integration.

Purpose of the Study:

To propose and describe a novel method for generating spin-polarized electrons on an integrated photonics chip.
To enable compact and efficient generation of spin-polarized electrons for nanoscale research.

Main Methods:

Utilizing laser-driven nanophotonic fields on an integrated photonics chip.
Employing a two-stage interaction process with a free-space drift length.
Manipulating electron wave function spin-dependent characteristics and spin states using optical near fields.

Main Results:

The proposed method introduces spin-dependent characteristics into the electron wave function's probability distribution.
The second stage effectively rotates spin states to produce electrons with high ensemble average spin expectation values.
Demonstrated potential for millimeter-scale chip implementation with tabletop lasers.

Conclusions:

This integrated photonics platform offers a compact and efficient solution for generating spin-polarized electrons.
The technology facilitates advanced studies of spin-dependent electric and magnetic effects at the nanoscale.
Paves the way for miniaturized spin-polarized electron sources for diverse scientific applications.