Altermagnetic splitting of magnons in hematite ($\alpha$-Fe${}_2$O${}_3$)

Rhea Hoyer, P. Peter Stavropoulos, Aleksandar Razpopov +3

We develop a four-sublattice spin-wave theory for the $g$-wave altermagnet candidate hematite ($\alpha$-Fe${}_2$O${}_3$), considering both its easy-axis phase below and its weak ferromagnet…