00977nas a2200145 4500008004100000245010700041210006900148260004100217300001200258490000900270520047400279100001800753700001500771856004500786 1987 eng d00aMany Body Theory of the Formation and Dynamics of Excitons in an Electron-Hole Gas at Low Temperatures0 aMany Body Theory of the Formation and Dynamics of Excitons in an bThe Japan Society of Applied Physics a685-6860 v26S33 aUsing functional differentiation to obtain the two-particle Green's functions, we give a systemmatic discussion of the collective modes in an electron-hole gas at low temperatures. Our analysis is based on the well known pairing approximation for the single particle self-energies and corresponds to the generalized RPA. The excitons with finite momentum appear as fluctuations of the electron-hole condensate and have a linear dispersion relation (Keldysh and Kozlov).1 aCôté, René1 aGriffin, A uhttp://jjap.ipap.jp/link?JJAPS/26S3/685/