title: Collective excitations of a spherically confined Yukawa plasma.
abstract: The complete spectrum of eigenmodes of a spherically confined Yukawa plasma is presented, based on first-principle molecular dynamics simulations. These results are compared with a recent fluid theory for the multipole modes of this system [H. Kählert and M. Bonitz, Phys. Rev. E 82, 036407 (2010)] and with the exact N-particle eigenmodes in the crystalline phase. Simulations confirm the existence of high-order modes found in cold fluid theory. We investigate the influence of screening, coupling, and friction on the mode spectra in detail. Good agreement between theory and simulation is found for weak to moderate screening and low-order modes. In addition, a number of new modes are observed which are missing in the fluid theory. The relations between the breathing mode in the fluid theory, simulation, and the crystal eigenmode are investigated in further detail.
authors: Institut für Theoretische Physik und Astrophysik, Christian-Albrechts Universität zu Kiel, D-24098 Kiel, Germany.
authors: H
authors: H
authors: Kählert
authors: M
authors: M
authors: Bonitz