In recent years, major experimental and theoretical efforts were made to explore the optical and transport properties of two-dimensional (2D) crystalline materials. Two-dimensional materials are characterized by highly confined, low-loss, and tunable plasmon polaritons, making them an ideal platform for exploring different regimes of light-matter interactions. One of the remarkable subjects is hyperbolic plasmons in novel 2D materials because of their highly confined and tunable nature, e.g., using chemical doping, gating, or strain. Recently, promising hyperbolic two-dimensional plasmon polaritons have been discovered for the first time in exfoliated Td -WTe2 thin films [Nature Commun. 11, 1158 (2020)]. Therefore, we investigated hyperbolic plasmons in the Td-WTe2 single layer and tilted Dirac cone phases of borophene. Moreover, 1T-TiSe2 belongs to a transition metal dichalcogenide (TMDC), which attracts much attention due to the appearance of CDW (charge density wave) orders. We found the dominant role of plasmon-phonon scattering, which, combined with the CDW gap excitations, leads to the anomalous temperature dependence of the plasmon linewidth across the CDW transition.


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