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

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Time-, spin-, and angle-resolved photoemission spectroscopy with a 1-MHz 10.7-eV pulse laser.

Kaishu Kawaguchi¹, Kenta Kuroda^1,2,3, Z Zhao⁴

¹Institute for Solid State Physics (ISSP), The University of Tokyo, Kashiwa, Chiba 277-8581, Japan.

The Review of Scientific Instruments

|August 4, 2023

Summary

Researchers developed a new time-, spin-, and angle-resolved photoemission spectroscopy (tr-SARPES) setup. This advanced technique enables detailed studies of ultrafast electron and spin dynamics in quantum materials with high resolution.

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Area of Science:

Condensed Matter Physics
Quantum Materials Science
Spectroscopy Techniques

Background:

Ultrafast electron and spin dynamics are crucial for understanding quantum materials.
Previous spectroscopic methods faced limitations in resolution and efficiency for studying these dynamics.

Purpose of the Study:

To present a novel time-, spin-, and angle-resolved photoemission spectroscopy (tr-SARPES) setup.
To enable high-resolution investigation of ultrafast electron and spin dynamics in quantum materials.

Main Methods:

Utilized a 10.7 eV pulse laser at a 1 MHz repetition rate as a probe source.
Combined a high-power Yb:fiber laser with ultraviolet-driven harmonic generation in Xe gas.
Integrated a SARPES apparatus with very-low-energy-electron-diffraction spin detectors.

Main Results:

Achieved significantly reduced photoemission space-charge effects despite high photon flux.
Enabled observation of a wide momentum range covering entire Brillouin zones with high momentum resolution.
Overcame low efficiency in spin-resolved measurements, especially for unoccupied states.

Conclusions:

The developed tr-SARPES setup offers unprecedented energy (25 meV) and time (360 fs) resolution.
This advancement facilitates in-depth studies of ultrafast electron and spin dynamics in modern quantum materials.