Altermagnetic order plus mirror symmetry in a square-octagon lattice yields a mirror Chern insulator, CM=2, whose two mirror-protected edge modes cross at separate momenta, called a type-II mirror Chern insulator.
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Type-II Mirror Chern Insulator in Altermagnets
Altermagnetic order plus mirror symmetry in a square-octagon lattice yields a mirror Chern insulator, CM=2, whose two mirror-protected edge modes cross at separate momenta, called a type-II mirror Chern insulator.