Cerenkov emission of plasmons by drifting Dirac electrons occurs in the hydrodynamic regime, where electron-electron collisions soften the plasmon velocity below the drift velocity, and is absent in the ballistic regime.
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Emission of plasmons by drifting Dirac electrons: where hydrodynamics matters
Cerenkov emission of plasmons by drifting Dirac electrons occurs in the hydrodynamic regime, where electron-electron collisions soften the plasmon velocity below the drift velocity, and is absent in the ballistic regime.