Highly anisotropic collective modes of altermagnetic superconductors with Bogoliubov Fermi surfaces
This research investigates how Bogoliubov Fermi surfaces (BFSs) in altermagnetic superconductors cause collective modes to become highly anisotropic. The study found that BFSs create strongly momentum-dependent phonon and Higgs modes, which are directly observable through the material's spin response, providing a way to probe the underlying superconducting structure.