Exciton collective modes in a bilayer of axion insulator ${\text{MnBi}}_2{\text{Te}}_4$

Olivia Liebman, Jonathan B. Curtis, Emily Been +1

We investigate the emergence of an exciton condensate and associated collective modes in a bilayer configuration of ${\text{MnBi}}_2{\text{Te}}_4$, an antiferromagnetic topological ins…