Empirical bridge function for strongly coupled yukawa systems

A simple bridge function for strongly coupled Yukawa systems is developed based upon a form previously extracted for a one-component plasma [H. Iyetomi, S. Ogata, and S. Ichimaru, Phys. Rev. A 46, 1051 (1992)]. Using the proposed bridge function in the modified hypernetted chain theory, excellent agreement is obtained with molecular dynamics simulations and the compressibility sum rule is satisfied to within a few percent. This result offers a simple and very accurate method to quickly compute correlation functions for Yukawa systems.