Year: 2026
Type: article
Abstract: Odd-wave magnets are the counterparts to even-wave altermagnets realizing odd-parity spin splitting. Normally discussed for noncollinear systems, they have recently been shown to appear in collinear magnetic states in the presence of loop currents. Here we study collective excitations of the paramagnetic and magnetic phase of the seminal Haldane-Hubbard model. We identify the existence topological excitons in the paramagnetic phase, and their condensation as the driving mechanism into the collinear Néel state. The latter realizes an odd-wave magnet with odd-parity magnons displaying a characteristic $f$-wave splitting. We further uncover that an electron bandgap closing ensures magnon bandgap closing causing a change in odd-parity magnon topology, as well as a drastically enlarged spin splitting. Our results establish the presence of topological excitons and odd-parity magnons in the Haldane-Hubbard, with potential realizations in Floquet-driven materials and cold atomic gases.
Source: Physical Review Letters
DOI: 10.1103/q1cs-j5py
Authors: Rintaro Eto, Johannes Knolle
Language: English
Subfield: Condensed Matter Physics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: green
Awards: G1520943153, G1768993395, G2809294039, G4710139657, G5099387829, G5536861278, EXC 2147: Komplexität und Topologie in Quantenmaterialien (CT.QMAT), G734228467, TRR 360: Eingeschränkte Quantenmaterie, SFB 1143: Korrelierter Magnetismus: Von Frustration zu Topologie, EXC 2111: Munich Center for Quantum Science and Technology (MCQST), G8908719260, G905520289, G936330020
OpenAlex ID: W7163649733
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