  Here we write down and prove closed commutation rules for Fermi bilinears in
a two-component Fermi system in terms of the relevant sea-bosons. We show how
the commutation rules come out correctly within the RPA-approximation as do the
zero temperature correlation functions. We write down hamiltonains of
nonrelativistic interacting electron-hole systems and point out several
attractive features such as the natural roles excitons play in this language.
We then use this language to derive a set of equations analogous to the
Semiconductor Bloch Equations in the presence of phonons and with external
fields such as those present in pump-probe experiments. We solve these
equations using parameters of interesting and topical materials such as GaN and
compare with some recent experimental data.
