Abstract
The plasmon excitations in a quasi-one-dimensional organic material are analyzed in terms of a simple tight-binding energy-band model. Within the random-phase approximation, the calculated plasmon dispersion and anisotropy are in quite good agreement with the electron-loss data on tetrathiafulvalene-tetracyanoquinodimethane. The observed plasmon damping is simply correlated with the finite electron lifetime and the absence of Landau damping is shown to follow from the one-dimensional character of the electron dynamics. Exchange corrections to the plasmon dispersion are found to be of the form $\ensuremath{\Delta}{\ensuremath{\omega}}_{q}=B{q}^{4}$, in contrast to the quadratic corrections in three-dimensional systems. Local-field and exchange corrections are estimated to be small. The acoustical plasmon modes are strongly damped by decay into the electron-hole continuum, in contrast to previous work.
Published Version
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