Two anomalous acoustic plasmons arise from the geometry of 2D type-II Dirac cones, beyond the conventional sqrt(q) form, with valley-dependent chirality and tunability by gap and substrate.
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Anomalous acoustic plasmons in two-dimensional over-tilted Dirac bands
Two anomalous acoustic plasmons arise from the geometry of 2D type-II Dirac cones, beyond the conventional sqrt(q) form, with valley-dependent chirality and tunability by gap and substrate.