Work

Fractionalized altermagnets: From neighboring and altermagnetic spin liquids to spin-symmetric band splitting

Year: 2025

Type: article

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 noncoplanar 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.

Source: Physical Review Research

DOI: 10.1103/physrevresearch.7.023152

Authors: João Augusto Sobral, Subrata Mandal, Mathias S. Scheurer

Institution: University of Stuttgart

Language: English

Topic: Advanced Condensed Matter Physics

Subfield: Condensed Matter Physics

Field: Physics and Astronomy

Domain: Physical Sciences

Open Access status: gold

Estimated APC paid: $2,625

Funder: European Commission