Density profile and breathing mode of strongly correlated spherical Yukawa plasmas

The structure of ``Yukawa balls,'' i.e. spherical 3D dust crystals, which recently have been produced [1], is well explained by computer simulations of charged Yukawa interacting particles within an external parabolic confinement [2]. Dynamical properties (e.g. breathing mode) of these systems were investigated by experiment, simulations as well as theoretically by using the ansatz of a uniform ground state density [3]. Here we show analytically that screening has a dramatic effect on the density profile which decreases away from the center [4,5] and which is in excellent agreement with MD simulations of Yukawa balls. This result is used to improve former calculations of the breathing mode [6].\newline References\newline [1] O. Arp et al. Phys. Rev. Lett. 93, 165004 (2004)\newline [2] M. Bonitz et al., Phys. Rev. Lett. 96, 075001 (2006)\newline [3] T. E. Sheridan, Phys. Plasmas 13, 022106 (2006)\newline [4] C. Henning et al., Phys. Rev. E 74, 056403 (2006)\newline [5] C. Henning at al., Phys. Rev. E (2007)\newline [6] C. Henning at al., submitted for publication