Regensburg 2025 – scientific programme
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MA: Fachverband Magnetismus
MA 9: Altermagnets I
MA 9.4: Talk
Monday, March 17, 2025, 15:45–16:00, H20
Spin-wave theory and magnon transport properties of altermagnetic hematite (α-Fe2O3) — •Rhea Hoyer1, P. Peter Stavropoulos2, Libor Šmejkal1,3,4, and Alexander Mook1 — 1Department of Physics, Johannes Gutenberg University Mainz, 55128 Mainz, Germany — 2Institut für Theoretische Physik, Goethe-Universität Frankfurt, 60438 Frankfurt am Main, Germany — 3Max Planck Institute for the Physics of Complex Systems, Nothnitzer Str. 38, 01187 Dresden, Germany — 4Institute of Physics, Czech Academy of Sciences, Cukrovarnická 10, 162 00 Praha 6, Czech Republic
We develop a four-sublattice spin-wave theory for the g-wave altermagnet hematite (α-Fe2O3) in its two magnetic phases: the easy-axis phase below, and the weak ferromagnetic phase above the Morin temperature. We estimate the Morin temperature with a free energy calculation. The relativistic magnon dispersion relation in the easy-axis phase shows the spin (or chirality) splitting typical of altermagnets. We investigate magnon transport properties with a particular focus on the crystal thermal Hall effect.
Keywords: altermagnets; hematite; thermal Hall effect; magnons