|Title||Many Body Theory of the Formation and Dynamics of Excitons in an Electron-Hole Gas at Low Temperatures |
|Publication Type||Journal Article |
|Year of Publication||1987 |
|Authors||Côté R, Griffin A |
|Journal||Japanese Journal of Applied Physics |
|Abstract||Using 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).