Berlin 2005 – wissenschaftliches Programm

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SYPS: Plasmen in ungewöhnlichen Situationen

SYPS 1: Symposium: Plasmas in unusual situations, Part I: Ultracold plasmas

SYPS 1.3: Hauptvortrag

Montag, 7. März 2005, 11:30–12:00, HU Audimax

Theory of strongly correlated charged particles in traps — •Michael Bonitz and Alexei Filinov — Institute for Theoretical Physics and Astrophysics, Christian-Albrechts-University Kiel, Leibnizstr. 15, 24098 Kiel

Charged particles which are spatially confined by trapping potentials constitute a peculiar type of plasmas which are non-neutral. Such plasmas can exist for very long times and may be manipulated in broad parameter ranges. Of special interest is the possibility to create and analyze in detail strong correlation phenomena, including the formation of bound states or of liquid-like and crystal-like collective behavior. Examples are ultracold ions in Paul traps, electron or positron plasmas in Penning traps, dusty plasmas, electrons and holes in quantum confined semiconductor structures or valence electrons of metal clusters.

In this talk we present theoretical results for classical two-dimensional and three-dimensional mesoscopic Coulomb crystals in parabolic spherical traps. After this, quantum Coulomb systems in traps are discussed. In particular, we present results for excitonic bound states in semiconductor quantum wells, including the influence of disorder (well width fluctuations), and for quantum Wigner crystals in quantum dots. Finally, a quantum kinetic theory for the short-time behavior of trapped correlated particles is outlined. Of particular interest is the dynamics of Coulomb correlations and the possibility of correlation induced cooling which was predicted a few years ago [1] and for which meanwhile a few interesting schemes have been proposed.

[1] D. Semkat, D. Kremp, and M. Bonitz, Phys. Rev. E 59, 1557 (1999)