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Symmetry Classification for Alternating Excitons in Two-Dimensional Altermagnets.

Jiayu David Cao1, Konstantin S Denisov1, Yuntian Liu1

  • 1University at Buffalo, State University of New York, Department of Physics, Buffalo, New York 14260, USA.

Physical Review Letters
|January 20, 2026
PubMed
Summary
This summary is machine-generated.

This study introduces a theoretical framework for understanding excitons in altermagnets (AMs), a class of 2D materials. The research predicts optical fingerprints and material candidates for novel excitonic properties in these magnetic systems.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Quantum Mechanics

Background:

  • Excitons significantly influence the optical properties of 2D materials, revealing intrinsic characteristics like spin-orbit coupling and magnetic ordering.
  • Altermagnets (AMs), a type of collinear antiferromagnet with nonrelativistic spin splitting, represent a burgeoning area of research in 2D materials.

Purpose of the Study:

  • To develop a theoretical framework for elucidating excitons in 2D altermagnets (AMs) using spin space group symmetry.
  • To classify exciton types and predict their optical properties and selection rules in AMs.

Main Methods:

  • Utilizing a theoretical framework based on spin space group representations to classify band combinations.
  • Employing effective Hamiltonians and the Bethe-Salpeter equation for detailed analysis.
  • Performing first-principles calculations to predict material candidates and validate theoretical predictions.

Main Results:

  • Two distinct cases of excitons (s-like and p-like) were identified in 2D AMs with spin-polarized valleys.
  • Optical selection rules were determined from calculated absorption spectra and exciton symmetries.
  • Several material candidates for realizing excitons in 2D AMs were predicted.

Conclusions:

  • The proposed framework provides essential optical fingerprints for various altermagnet configurations.
  • Tunability of excitonic properties, including strain-induced effects, was demonstrated, enabling valley-polarized photocurrent generation.