Abstract
The density response of a two-dimensional charged Bose fluid at absolute zero temperature is studied beyond the random-phase approximation by including the many-body correlation effects. the correlations are accounted for through a static local-field correction obtained by satisfying in an approximate way the third frequency-moment sum rule of the density response function. the static structure factor, the pair-correlation function, the elementary excitation spectrum, and the ground-state energy are calculated over a wide range of boson number density. Wherever available, the results are compared with the recent diffusion Monte Carlo data and the calculation based upon the theory of Singwi et al. We also present a comparison between the results of electron and charged Bose fluids for pair-correlation function and elementary excitation spectrum.
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