Coupled charged Bose quantum wires

We investigate the effect of many-body correlations on the ground-state pro perties of two coupled charged Bose quantum wires. The intrawire and interw ire correlations are treated on the same footing within the self-consistent mean-field theory of Singwi, Tosi, Land and Sjolander. Static properties, viz., pair-correlation functions, local-field correction factors, screened interactions and susceptibilities, are calculated for a range of wire spaci ngs d, wire radii R-0, and boson density parameters r(s). We find that the qualitative dependence of intrawire correlations on r(s) and R-0 remains th e same as found for an isolated wire, except that they become slightly weak er with the decreasing spacing d. The interwire correlations, on the other hand, depend strongly on d and are found to grow in magnitude with decreasi ng d. Further, we find no evidence for the existence of a charge-density-wa ve ground state in the density range investigated, 1 less than or equal to r(s) less than or equal to 8, in the close proximity of wires. A comparison with the similar studies on the coupled electron quantum wires reveals tha t the charge-density-wave instability observed there may be an artifact of the neglect of interwire correlation effects.