High-resolution three-dimensional spin- and angle-resolved photoelectron spectrometer using vacuum ultraviolet laser...

Area of Science:

• Condensed Matter Physics
• Materials Science
• Spectroscopy

Background:

• Understanding spin-dependent electronic states is crucial for advanced materials and spintronic devices.
• Traditional spin- and angle-resolved photoelectron spectroscopy (SARPES) often requires large synchrotron facilities.
• Developing compact, high-resolution SARPES systems is essential for broader accessibility and in-situ studies.

Purpose of the Study:

• To describe a novel spin- and angle-resolved photoelectron spectroscopy (SARPES) apparatus utilizing a vacuum-ultraviolet (VUV) laser.
• To demonstrate the capability of the developed laser-SARPES system for high-resolution analysis of spin-split band structures.
• To highlight the applicability of this machine for investigating spin-dependent electronic states with meV energy resolution.

Main Methods:

• Development of a spin- and angle-resolved photoelectron spectroscopy (SARPES) apparatus.
• Integration of a vacuum-ultraviolet (VUV) laser (hν = 6.994 eV) with a hemispherical photoelectron analyzer.
• Equipping the analyzer with an electron deflector and twin very-low-energy-electron-diffraction-type spin detectors for 3D spin vector analysis.

Main Results:

• The developed laser-SARPES apparatus achieves an energy resolution of 1.7 meV.
• Demonstrated quick SARPES measurements on the spin-split band structure of a Bi(111) film.
• Achieved 7 meV energy resolution and 0.7° angular resolution in measurements on Bi(111) films.

Conclusions:

• The novel laser-SARPES machine offers high energy and angular resolution for probing spin-dependent electronic states.
• This system is suitable for investigating materials with spin-split band structures on an energy scale of a few meV.
• The compact laser-SARPES apparatus provides a powerful tool for condensed matter and materials science research.