Study on magnetized strongly coupled plasmas by using charged fine particles in a liquid

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A simple two-dimensional (2-D) strongly coupled one-component plasma system has been developed by confining charged fine particles on oil surface.The fine silica (SiO_2 particles placed on the bottom of concave electrode where silicon oil is filed are charged up by applying a voltage with respect to the upper glass electrode which is coated by electro-conductive film (ITO). The particles move upward by the electric field between the electrodes and confined on the oil surface by the surface tension.This new system has several advantages in studying 2-D Coulomb solidification compared with the colloidal suspension in a water: the charge of the particles can be easily controlled by the voltage, the number of impurity ions which shield out the Coulomb potential can be reduced in the insulating oil.We observed the long time evolution of Coulomb crystal growth and the development of defect and dislocation in the crystal. We also study the effect of magnetic dipole interactions among particles by using Ni coated fine particles.