Author/Authors :
Sing، نويسنده , , Lawrence M. and Grigoryan، نويسنده , , V.G. and Paasch، نويسنده , , G. and Knupfer، نويسنده , , M. and Fink، نويسنده , , J. and Lévy، نويسنده , , F. and Berger، نويسنده , , H. and Lommel، نويسنده , , B. and Aكmus، نويسنده , , W.، نويسنده ,
Abstract :
We present results of experimental and theoretical studies of the plasmon dispersion in the quasi-one-dimensional conductors (TaSe4)2I and K0.3MoO3. For both compounds, the dispersion relation, as measured by electron energy-loss spectroscopy in transmission, is quasilinear over a wide momentum range. Different theoretical approaches are discussed to explain the data, all based on a one-band model within the framework of the random-phase approximation. From this analysis, we find in contrast to photoemission measurements no hint for singular one-dimensional properties.
