Dresden 2026 – scientific programme
Parts | Days | Selection | Search | Updates | Downloads | Help
TT: Fachverband Tiefe Temperaturen
TT 98: Altermagnets
TT 98.8: Talk
Friday, March 13, 2026, 11:30–11:45, CHE/0091
Projectively implemented altermagnetism in an exactly solvable quantum spin liquid — •Avedis Neehus1,2, Achim Rosch3, Johannes Knolle1,2,4, and Urban Seifert3 — 1Technical University of Munich, TUM School of Natural Sciences, Physics Department, 85748 Garching, Germany — 2Institute for Theoretical Physics, University of Cologne, 50937 Cologne, Germany — 3Blackett Laboratory, Imperial College London, London SW7 2AZ, United Kingdom — 4Munich Center for Quantum Science and Technology (MCQST), Schellingstr. 4, 80799 München, Germany
Altermagnets are a new class of symmetry-compensated magnets with large spin splittings. Here, we show that the notion of altermagnetism extends beyond the realm of Landau-type order: we study exactly solvable Z2 quantum spin(-orbital) liquids (QSL), which simultaneously support magnetic long-range order as well as fractionalization and Z2 topological order. Our symmetry analysis reveals that in this model three distinct types of “fractionalized altermagnets (AM*)” may emerge, which can be distinguished by their residual symmetries. Importantly, the fractionalized excitations of these states carry an emergent Z2 gauge charge, which implies that they transform projectively under symmetry operations. Consequently, we show that “altermagnetic spin splittings” are now encoded in a momentum-dependent particle-hole asymmetry of the fermionic parton bands. We discuss consequences for experimental observables such as dynamical spin structure factors and (nonlinear) thermal and spin transport.
Keywords: Altermagnets; Spin-liquids; Projective symmetries; Gauge theory; SET