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Updated: Jul 23, 2025
Experimental Methods for Spin- and Angle-Resolved Photoemission Spectroscopy Combined with Polarization-Variable Laser
Published on: June 28, 2018
Improvement of image-type very-low-energy-electron-diffraction spin polarimeter
Heming Zha1,2, Wenjing Liu1,2, Deyang Wang1,2
1Center for Excellence in Superconducting Electronics, State Key Laboratory of Functional Materials for Informatics, Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences, Shanghai 200050, People's Republic of China.
High-resolution spin- and angle-resolved photoemission spectroscopy (SARPES) instruments enable detailed studies of quantum materials. This study demonstrates a new SARPES system with enhanced resolution for investigating spin-polarized electronic states and spin-layer locking in materials like Bi(111).
Area of Science:
- Condensed Matter Physics
- Materials Science
- Quantum Materials
Background:
- Spin- and angle-resolved photoemission spectroscopy (SARPES) is vital for characterizing spin-resolved electronic band structures.
- High efficiency and resolution are critical for detailed investigations of quantum materials.
Purpose of the Study:
- To report the performance of a novel SARPES instrument featuring a second-generation multichannel very-low-energy-electron-diffraction spin polarimeter.
- To demonstrate the instrument's capabilities using SARPES measurements on Bi(111) films.
Main Methods:
- Utilized a home-made multichannel very-low-energy-electron-diffraction spin polarimeter for SARPES.
- Achieved energy resolution of 7.2 meV and angular resolution of 0.52°.
- Combined experimental SARPES data with density functional theory calculations.
Main Results:
- Confirmed spin polarization of bulk states in Bi(111) film due to spin-layer locking and local inversion asymmetry.
- Identified surface states at 0.77 eV binding energy with a spin polarization of 1.0 ± 0.11.
- Demonstrated improved resolution and stability over the first-generation instrument.
Conclusions:
- The enhanced SARPES instrument provides a robust platform for exploring spin-polarized electronic states in quantum materials.
- The findings validate the instrument's capability for detailed band structure analysis and spin polarization measurements.
