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Altermagnetism from coincident Van Hove singularities: application to κ-Cl
Yue Yu1, Han Gyeol Suh2, Mercè Roig3
1Department of Physics, University of Wisconsin-Milwaukee, Milwaukee, Wisconsin, 53201, USA. yu36@uwm.edu.
Nature Communications
|March 27, 2025
Summary
We propose a new method to create 2D altermagnets using Van Hove singularities, crucial for spintronics. This approach enables novel interactions leading to altermagnetism and other exotic electronic orders.
Area of Science:
- Condensed Matter Physics
- Materials Science
- Spintronics
Background:
- Two-dimensional (2D) altermagnets are key for advanced spintronics.
- Stabilizing these materials requires understanding their underlying electronic properties.
Purpose of the Study:
- Propose a microscopic template for stabilizing 2D altermagnetism.
- Investigate novel electronic interactions arising from coincident Van Hove singularities.
Main Methods:
- Theoretical modeling based on non-symmorphic symmetries in 2D space groups.
- Analysis of Hamiltonian properties and hopping interactions.
- Application to quasi-2D organic materials (κ-Cl).
Main Results:
- Identified coincident Van Hove singularities as a mechanism for 2D altermagnetism.
- Discovered new hopping interactions distinct from existing models.
- Demonstrated potential for altermagnetism, nematicity, and superconductivity.
Conclusions:
- The proposed template provides a pathway to realize 2D altermagnets.
- The findings offer insights into novel electronic instabilities in 2D materials.
- The study connects theoretical predictions to experimental systems like κ-Cl.
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