Sound speed and diffusion in 2D Yukawa liquids: Effect of dipole–dipole interaction

Abstract

The two‐dimensional (2D) Yukawa liquid with an additional screened dipole–dipole interaction is considered in connection with the 2D system of charged dust particles in complex plasmas. Particularly, the sound speed and diffusion in the case the Yukawa interaction potential dominant over the screened dipole–dipole interaction are analysed. Increase in the value of the sound speed and suppression of the super‐diffusion due to the additional dipole–dipole interaction are reported. This effect is explained by the stronger inter‐particle correlations induced by the additional dipole–dipole interaction.