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Inelastic electron scattering is applied to investigate the impact ofpotassium intercalation on the charge carrier plasmon energy and dispersion inthe charge-density wave (CDW) bearing compound 2H-tantalum-diselenide. Weobserve an unususal doping dependence of the plasmon dispersion, which evenchanges sign upon alkali addition. In contrast to the continous energy shift ofthe plasmon position upon doping at lowest momentum transfer, its dispersionchanges in a rather discontinuous manner. We argue that the observed dynamicscan only be explained in a picture, where complex phenomena are taken intoaccount including the suppression of the CDW upon doping as well as theinterplay of the CDW and the plasma resonance.

Doping Dependence of the Plasmon Dispersion in 2H-Tantalum-Diselenide