Abstract
We calculate the electron density response function of electron-hole multilayer systems in the presence of spin-orbit interaction modeled by Rashba terms. It is found that the spin-orbit coupling leads to a redistribution of the absorption spectral weight between the particle-hole excitation and the plasmon excitation. The interplay of Coulomb interactions and spin-orbit interaction resulted in a suppression or enhancement of the optical absorption due to plasmons. Our result indicates that the spin-orbit coupling can serve as a tuning mechanism for optical absorption in spintronics systems.
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