Slave-rotor theory on the Lieb-lattice altermagnetic Hubbard model finds interaction-driven transitions from normal metal to altermagnetic metal to altermagnetic insulator to Mott insulator, with spin splitting suppressed in the final phase.
Theory of Angle Resolved Photoemission Spectroscopy of Altermagnetic Mott Insulators
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abstract
Altermagnetism has emerged as an unconventional form of collinear magnetism with spatial rotational symmetries, that give rise to strongly spin-split bands despite of an underlying fully-compensated antiferromagnetic order. Here, we develop a theory for the Angle Resolved Photoemission Spectroscopy (ARPES) response of altermagnetic Mott insulators. Crucially, the spectrum does not simply reflect the non-interacting 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 work paves the way for a systematic study of doping effects and correlation phenomena in altermagnetic Mott insulators.
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Slave-rotor theory of correlated altermagnets on the Lieb lattice
Slave-rotor theory on the Lieb-lattice altermagnetic Hubbard model finds interaction-driven transitions from normal metal to altermagnetic metal to altermagnetic insulator to Mott insulator, with spin splitting suppressed in the final phase.