In the Kek-alpha model, two Dirac cones with different Fermi velocities generate a two-branch particle-hole continuum that shrinks the region of stable plasmons as alpha increases.
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Suppressed plasmon excitations, enhanced damping and static screening in Kek-Y strained $\alpha-\mathcal{T}_3$ model
In the Kek-alpha model, two Dirac cones with different Fermi velocities generate a two-branch particle-hole continuum that shrinks the region of stable plasmons as alpha increases.