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Light-Induced Odd-Parity Magnetism in Conventional Antiferromagnetism
Shengpu Huang1, Zheng Qin1, Fangyang Zhan1
1Chongqing University, Chongqing University, Institute for Structure and Function and Department of Physics and Chongqing Key Laboratory for Strongly Coupled Physics, Chongqing 400044, People's Republic of China and Center of Quantum materials and devices, Chongqing 400044, People's Republic of China.
Physical Review Letters
|April 11, 2026
Summary
Floquet engineering enables odd-parity magnetism in 2D collinear antiferromagnets using light. This method allows flexible control over spin splitting, offering new avenues for designing magnetic materials.
Area of Science:
- Condensed Matter Physics
- Quantum Materials
- Spintronics
Background:
- Nonrelativistic odd-parity magnetism is gaining attention, particularly with altermagnets.
- Odd-parity spin splitting is typically associated with noncollinear magnetic structures.
- Achieving controllable odd-parity magnetism in collinear systems remains a challenge.
Purpose of the Study:
- To demonstrate a universal strategy for inducing odd-parity magnetism in 2D collinear antiferromagnets.
- To explore the role of Floquet engineering and light irradiation in achieving this phenomenon.
- To investigate the tunability of light-induced spin splitting.
Main Methods:
- Symmetry analysis and effective model development.
- Application of Floquet engineering with periodic light fields (circular, elliptical, bicircular).
- First-principles calculations combined with Floquet theorem.
Main Results:
- Floquet engineering provides a universal route to odd-parity magnetism in 2D collinear antiferromagnets.
- Light-induced spin splitting is controllable via crystalline symmetry and light polarization.
- Demonstrated feasibility in specific 2D collinear antiferromagnetic materials.
Conclusions:
- Floquet engineering is a powerful tool for realizing tunable odd-parity spin splitting.
- This approach expands the design principles for unconventional compensated magnetism.
- Offers a novel pathway for spintronic applications using light-controllable magnetism.
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