Fractionalized Altermagnets: from neighboring and altermagnetic spin-liquids to spin-symmetric band splitting

Abstract

We study quantum-fluctuation-driven fractionalized phases in the vicinity of altermagnetic order. First, the long-range magnetic orders in the vicinity of collinear altermagnetism are identified; these feature a non-coplanar "orbital altermagnet" which has altermagnetic symmetries in spin-rotation invariant observables. We then describe neighboring fractionalized phases with topological order reached when quantum fluctuations destroy long-range spin order, within Schwinger-boson theory and an SU(2) gauge theory of fluctuating magnetism. Discrete symmetries remain broken in some of the fractionalized phases, with the orbital altermagnet becoming an "altermagnetic spin liquid". We compute the electronic spectral function in the doped system, which is characterized by split Fermi surfaces with preserved spin-rotation symmetry.

arXiv comment5+12 pages, 3+1 figures; V2: minor changes, updated refs

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Cited by in corpus (6)

• Dominant orbital magnetization in the prototypical altermagnet MnTe
• Altermagnetic polarons: the fate of alter magnetic band splittings at strong coupling
• Magnetic-field-tuned randomness in inhomogeneous altermagnets
• Impact of strong electronic correlations on altermagnets: the case of NiS2
• Projectively implemented altermagnetism in an exactly solvable quantum spin liquid
• Orbital altermagnetism on the kagome lattice and possible application to $A$V${}_3$Sb${}_5$