Abstract
Within a hydrodynamic approach we investigate the dynamics of an inhomogeneous electron-hole gas coupled to phonons in Te and the corresponding THz emission. We find that the longitudinal inhomogeneity of the photogenerated electron-hole gas---due to short absorption lengths in Te---gives rise to screening ineffectiveness for nonzero wave vector modes. This allows for THz dynamics and emission at the bare LO phonon frequency ${\ensuremath{\nu}}_{\mathrm{LO}}$ even at high carrier densities. Screening ineffectiveness thus provides an appealingly simple explanation for the existence of bare modes at ${\ensuremath{\nu}}_{\mathrm{LO}}$ in longitudinally inhomogeneous systems such as Te; no lateral inhomogeneity of the excitation spot is needed here.
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