A bilayer acoustic crystal with a constructed pseudo-time-reversal operator realizes the first time-reversal-invariant altermagnetic acoustic system, observed via pseudospin-split bands and orthogonal propagation.
Feng et al., An anomalous Hall effect in altermagnetic ruthenium dioxide, Nat
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Time-Reversal-Invariant Altermagnetic Acoustic Crystals
A bilayer acoustic crystal with a constructed pseudo-time-reversal operator realizes the first time-reversal-invariant altermagnetic acoustic system, observed via pseudospin-split bands and orthogonal propagation.