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Projectively Implemented Altermagnetism in an Exactly Solvable Quantum Spin Liquid.
Avedis Neehus1,2, Achim Rosch3, Johannes Knolle1,2,4
1Technical University of Munich, TUM School of Natural Sciences, Physics Department, 85748 Garching, Germany.
Physical Review Letters
|January 20, 2026
Summary
Researchers explored quantum spin liquids, revealing novel "fractionalized altermagnets" with unique symmetries and emergent gauge charges. These findings link altermagnetism to particle-hole asymmetry in parton bands, impacting transport properties.
Area of Science:
- Condensed Matter Physics
- Quantum Magnetism
- Topological Phases
Background:
- Altermagnets represent a novel class of magnetic materials characterized by symmetry compensation and significant spin splittings.
- Existing understanding of altermagnetism primarily focuses on Landau-type ordered states.
Purpose of the Study:
- To investigate the extension of altermagnetism beyond Landau-type order.
- To explore exactly solvable Z_{2} quantum spin liquids (QSLs) that exhibit both magnetic order and topological properties.
- To identify and characterize novel types of fractionalized altermagnets.
Main Methods:
- Symmetry analysis of exactly solvable Z_{2} quantum spin liquids.
- Investigation of emergent gauge charges in fractionalized excitations.
- Analysis of momentum-dependent particle-hole asymmetry in fermionic parton bands.
Main Results:
- Three distinct types of "fractionalized altermagnets (AM^{*})" were identified, differentiated by their residual symmetries.
- Fractionalized excitations were found to carry emergent Z_{2} gauge charges, leading to projective symmetry transformations.
- Altermagnetic spin splittings are encoded in the momentum-dependent particle-hole asymmetry of fermionic parton bands.
Conclusions:
- The concept of altermagnetism is extended to systems with fractionalization and Z_{2} topological order, such as QSLs.
- Fractionalized altermagnets exhibit unique properties related to emergent gauge charges and symmetry transformations.
- The study provides a theoretical framework connecting altermagnetic spin splittings to particle-hole asymmetry and discusses implications for experimental observables in transport and spin dynamics.
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