Structure and dynamics of Yukawa dusty plasmas and dusty plasma mixtures

Dusty plasmas can be regarded as Yukawa system in a one-dimensional potenti al well. We extend the analysis on dusty plasmas to the two-dimensional Yuk awa particles. At low temperatures, dust particles sit in a plane which is perpendicular to the gravitational field under appropriate conditions. When they are also confined laterally by an electrode, we have a finite two-dim ensional system of Yukawa particles. The low temperature structures are obt ained by molecular dynamics simulations and the results are reproduced by t heoretical analyses. The correlation energy of the Yukawa particles has bee n shown to play an essential role in structure formations. As for dynamics of this system, the tendency of a change from the surface meeting in system s with short-ranged interactions to possible surface freezing of Coulombic system is observed.