GROUND-STATE OF A DOUBLE-LAYER CHARGED BOSE SYSTEM

The ground state of a double-layer charged Bose system is investigated beyond the random-phase approximation by including the many-body corr elation effects. The correlations within the layer are accounted for w ithin the self-consistent theory of Singwi, Tosi, Land, and Sjolander, while we have neglected the effect of interlayer correlations, The st atic susceptibility, the elementary excitation spectrum, and the stati c screened potentials are calculated and their dependence on the boson number density and the layer spacing is examined. Results are compare d with the recent work of Tanatar and Das where correlations are not i ncluded. It is found that the inclusion of correlation effects combine d with the interlayer interactions can significantly alter the nature of the ground state and, in particular, can favor an inhomogeneous cha rge-density-wave ground state. A comparison is also made in terms of s creened potentials with the double-layer electron system that enables one to have a deeper insight into the role played by the exchange and Coulomb correlations separately.