Berlin 2015 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 33: Low-Dimensional Systems: Other Materials

TT 33.9: Talk

Tuesday, March 17, 2015, 11:45–12:00, H 3010

Doping dependence of the plasmon dispersion in 2H-TaSe₂ and related systems — •Eric Müller, Carsten Habenicht, Martin Knupfer, and Bernd Büchner — IFW-Dresden, P.O.Box 270116, DE-01171 Dresden, Germany

The electronic excitations of 2H-TaSe₂ and related single crystalline systems have been investigated using electron energy-loss spectroscopy. These systems consist of hexagonal layers with weak interlayer van-der-Waals bonding. We show the influence of alkali metal intercalation on the energy position and the dispersion of the charge-carrier plasmon. Further we demonstrate how the slope of dispersion is affected by the additional charge and the change of charge-carrier density in consequence. Our results indicate a universal evolution of the plasmon dispersion independent of the intercalant (Na, K) and the dichalcogenide (TaSe₂, TaS₂, NbSe₂).