Checkerboard-lattice Hubbard electrons are unstable to weak-coupling altermagnetism whose magnons display alternating chirality splitting.
Fedchenkoet al., Observation of time-reversal sym- metry breaking in the band structure of altermagnetic RuO2, Sci
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Weak-coupling altermagnetism and chiral magnetic excitations in a checkerboard lattice
Checkerboard-lattice Hubbard electrons are unstable to weak-coupling altermagnetism whose magnons display alternating chirality splitting.