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Updated: Sep 18, 2025
08:01
Spectral and Angle-Resolved Magneto-Optical Characterization of Photonic Nanostructures
Published on: November 21, 2019
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Nonlinear Photocurrent as a Hallmark of Altermagnet.
Xiao Jiang1, Uiseok Jeong1, Shunsuke Sato2,3
1Department of Physics, Ulsan National Institute of Science and Technology, Ulsan 689-798, Republic of Korea.
ACS Nano
|June 26, 2025
Summary
Altermagnetism, a distinct magnetic state, requires new probing methods. This study reveals that nonlinear photocurrents can effectively distinguish altermagnets from other magnetic states by analyzing their unique band geometry.
Area of Science:
- Condensed Matter Physics
- Materials Science
- Spintronics
Background:
- Altermagnetism is a novel magnetic state requiring differentiation from ferromagnetism and antiferromagnetism.
- Distinguishing altermagnetism necessitates reliable experimental probes for its unique properties.
Purpose of the Study:
- To identify and categorize spin and charge photocurrents in compensated collinear magnets.
- To develop a method for distinguishing altermagnetism from other magnetic states.
Main Methods:
- Investigation of nonrelativistic spin and relativistic magnetic groups.
- First-principles calculations for the altermagnetic phase of MnO.
- Analysis using a simplified four-band model.
Main Results:
- Charge and spin photocurrents in altermagnets share a similar temperature profile, unlike in antiferromagnets.
- Nonlinear photocurrents directly reflect the magnetic band geometry of altermagnets.
- Injection current correlates with interband Berry curvature and alternating spin splitting.
Conclusions:
- Nonlinear photocurrents offer a promising tool for probing altermagnetism.
- This method can reveal the specific magnetic phase and band geometry of altermagnets.
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