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.
Plasmons and screening in a monolayer of MoS$_2$
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abstract
We investigate the dynamical dielectric function of a monolayer of molybdenum disulfide within the random phase approximation. While in graphene damping of plasmons is caused by interband transitions, due to the large direct band gap in monolayer MoS$_2$ collective charge excitations enter the intraband electron hole continuum similar to the situation in two-dimensional electron and hole gases. Since there is no electron-hole symmetry in MoS$_2$, the plasmon energies in p- and n-doped samples clearly differ. The breaking of spin degeneracy caused by the large intrinsic spin-orbit interaction leads to a beating of Friedel oscillations for sufficiently large carrier concentrations, for holes as well as for electrons.
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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.