Dynamic correlations in double-layer electron systems - art. no. 165328

study the effects of dynamic correlations on the ground-state properties of a double-layer dimensional electron gas within the quantum Singwi-Tosi-Lan d-Sjolander theory (STLS). The intralayer and interlayer static structure f actors. the pair-correlation functions, and the wave vector and frequency-d ependent local-field factors have been calculated for a range of electron d ensities and layer separations. We find that the local-field factors have a n oscillatory frequency dependence and the magnitude of interlayer local-fi eld factors is about an order of magnitude smaller than that of the intrala yer. Our results are compared with the random-phase approximation and the s tatic STLS approximation to assess the importance of dynamical correlations . We also calculate the dispersion relations for the optical and acoustic p lasmons and the damping of these modes to compare them with other mean-fiel d theories, and we comment on the relevance of our results to the recent ex periments.