Dielectric Response Functions of Multi-Component Hot Carrier Plasmas

Finite temperature dielectric responses of a multi-component hot carrier plasma are investigated. Spectral analyses of component-resolved electronic polarization functions and the effective dielectric function of the plasma are performed to explore their dynamic and nonlocal behaviors including the effects of finite-temperature dynamic screening of the carriers. We show that spectral behavior of dielectric response functions of a multi-component plasma are quite distinct from that of a conventional single component plasma and that, for a photo-generated hot carrier plasma of an ideal wurtzite GaN with high carrier densities, the well-defined optic plasmonic modes are clearly seen well outside the single particle excitation continuum of lighter mass electrons and that an additional low frequency acoustic plasmonic branch is located outside single particle excitation continuum of doubly degenerate heavier mass A-holes. The contribution of the heavier mass species to dressed polarization function is very similar to the case of bare polarization function. We also find that the dispersion relation of the anti-screening peaks follows that of the optical plasmon mode in a multi-component plasma.