Interaction-enhanced altermagnet in the Hatsugai-Kohmoto model

We investigate the interplay between altermagnetic band structures and electronic correlations by focusing on the d x 2 − y 2 altermagnetic generalization of the Hatsugai-Kohmoto model. We find that with increasing interaction, a many-body Lifshitz transition takes place when doubly occupied regions disappear from the Fermi surface and almost all momentum states become fully spin polarized. This is termed interaction-enhanced altermagnet. We find that the dynamical susceptibility, which possesses only transverse nonzero components for small wave vectors, develops a gap proportional to the interaction strength and displays a sharp peak at a frequency increasing with the interaction. Above the Lifshitz transition, this peak moves to the lower gap edge and becomes log divergent. The signal intensity increases with the interaction up until the Lifshitz transition and saturates afterward. The static susceptibility remains unaffected by the correlations and altermagnetism reduces the static transverse response.