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Theory of Angle Resolved Photoemission Spectroscopy of Altermagnetic Mott Insulators

Lorenzo Lanzini1,2,*, Purnendu Das3,1,2, and Michael Knap1,2

  • *Contact author: lorenzo.lanzini@polytechnique.edu
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Phys. Rev. Lett. 137, 056501 – Published 28 July, 2026

DOI: https://doi.org/10.1103/1d1n-cssv

Abstract

Altermagnetism has emerged as an unconventional form of collinear magnetism with spatial rotational symmetries, that give rise to strongly spin-split bands despite an underlying fully compensated antiferromagnetic order. Here, we develop a theory for the angle resolved photoemission spectroscopy response of altermagnetic Mott insulators. Crucially, the spectrum does not simply reflect the noninteracting band structure, but instead a magnetic polaron is formed at low energies, that can be interpreted as a spinon-holon bound state. We develop a spinon-holon parton theory and predict a renormalized bandwidth that we confirm by tensor network simulations. We analyze the characteristic spin-split spectrum and identify a spin-dependent spectral weight of the magnetic polaron, resulting from the altermagnetic symmetry. Our Letter paves the way for a systematic study of doping effects and correlation phenomena in altermagnetic Mott insulators.

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Phys. Rev. Lett. 137, 056501– Published 28 July, 2026
  • Received 9 June 2025
  • Revised 13 November 2025
  • Accepted 16 June 2026
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