Many-body Correlation Effects in the Spatially Separated Electron and Hole Layers in the Coupled Quantum Wells

The many-body correlation effects in the spatially separated electron and hole layers in the coupled quantum wells are investigated. The specific case of the many-component electron-hole system is considered. Keeping the main diagrams in the parameter of the inverse number of components allows us to justify the RPA diagram selection. The ground state of the system is found to be the electron-hole liquid which possesses the energy smaller than the exciton phase. The connection is discussed between the results obtained and the experiments in which the inhomogeneous state in the coupled quantum wells is revealed.