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P: Plasmaphysik

P 34: Dichte Plasmen 2 und Theorie 2

P 34.1: Vortrag

Donnerstag, 30. März 2006, 11:15–11:30, 1004

Coulomb crystallization in two-component plasmas — •Michael Bonitz¹, Vladimir Filinov², Pavel Levashov², Vladimir Fortov², and Holger Fehske³ — ¹Institut für Theoretische Physik und Astrophysik, Uni Kiel, Leibnizstr. 15, 24098 Kiel — ²Institute for High Energy Density, Izhorskaya 13/19, Moscow 127412 Russia — ³Institut für Physik, Universität Greifswald, 17487 Greifswald

The analysis of Coulomb crystallization is extended from one-component to two-component plasmas [1]. Critical parameters for the existence of Coulomb crystals are derived for both classical and quantum crystals. In the first case, a critical charge ratio is derived whereas in the latter case, a critical mass ratio of the two charged components is found which is of the order of 80. Thus, protons and alpha particles are predicted to support a Coulomb crystal which should be observable experimentally. Furthermore, holes in semiconductors with sufficiently flat valence bands are predicted to spontaneously order into a regular lattice. Such crystals in two-component plasmas are intimately related to Coulomb crystals of bare nuclei expected to exist in white dwarf stars and in the crust of neutron stars as well as to ion crystals produced in the laboratory. A unified phase diagram of two-component Coulomb crystals is presented and is verified by first-principle computer simulations.
M. Bonitz, V.S. Filinov, P. Levashov, V.E. Fortov, and H. Fehske, Phys. Rev. Lett. issue of December 9 (2005)