Multiphoton absorption provides symmetry-selective fingerprints for planar altermagnets, with two-photon response for d-wave, four-photon for g-wave, and six-photon for i-wave order via absent direct contributions in specific polarization channels.
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Symmetry matching between altermagnets and unconventional superconductors generates bulk zero-energy flat bands as Bogoliubov Fermi surfaces and distinct curved or flat surface states detectable by tunneling.
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Engineering subgap states in superconductors by the symmetry of altermagnetism
Symmetry matching between altermagnets and unconventional superconductors generates bulk zero-energy flat bands as Bogoliubov Fermi surfaces and distinct curved or flat surface states detectable by tunneling.