High-frequency damping of plasmons in quasi-one-dimensional electron systems

An asymptotic expression for the imaginary part of the dynamic dielectric function ${\mathrm{\varepsilon }}_2$(k,ω) is studied for model quasi-one-dimensional (Q1D) electron systems. Derived within the two-particle-hole pair excitation approximation, valid for all k and high frequencies, ${\mathrm{\varepsilon }}_2$(k,ω) is utilized to calculate the plasmon damping in a GaAs Q1D structure. An interpolation formula for the frequency dependence of the dynamic local-field factor G(k,ω) is obtained.