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Experimental Methods for Spin- and Angle-Resolved Photoemission Spectroscopy Combined with Polarization-Variable Laser
Published on: June 28, 2018
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Laser-based angle-resolved photoemission spectroscopy with micrometer spatial resolution and detection of
Takuma Iwata1,2, T Kousa1, Y Nishioka1
1Graduate School of Advanced Science and Engineering, Hiroshima University, 1-3-1 Kagamiyama, Higashi-Hiroshima, 739-8526, Japan.
Scientific Reports
|January 4, 2024
Summary
We developed a new laser-based spin- and angle-resolved photoemission spectroscopy (µ-SARPES) apparatus. This advanced system achieves micrometer spatial resolution for detailed electronic structure and spin polarization studies.
Area of Science:
- Condensed matter physics
- Surface science
- Spectroscopy
Background:
- High spatial resolution is crucial for probing localized electronic phenomena.
- Current techniques often lack the combined spatial and spin resolution needed for advanced materials.
- Understanding spin polarization in 3D is essential for next-generation electronics.
Purpose of the Study:
- To develop and demonstrate a novel µ-SARPES apparatus.
- To achieve micrometer spatial resolution in spin- and angle-resolved photoemission spectroscopy.
- To enable 3D spin polarization mapping with high energy and spatial resolution.
Main Methods:
- Integration of a high-resolution photoelectron spectrometer with a focused 6 eV laser.
- Implementation of a high-precision sample stage and a double very-low-energy-electron-diffraction spin detector.
- Utilizing laser-based excitation and advanced spin detection for µ-SARPES.
Main Results:
- Achieved energy resolution of 1.5 meV (without spin) and 5.5 meV (with spin detection).
- Demonstrated spatial resolution better than 10 µm.
- Successfully mapped electronic structures and 3D spin polarization of topological insulators and patterned surfaces.
Conclusions:
- The developed µ-SARPES apparatus offers unprecedented spatial and spin resolution.
- This technique is suitable for investigating complex materials and nanoscale phenomena.
- Enables detailed studies of spin-dependent electronic properties at the micrometer scale.
