HIDPL Articles
Permanent URI for this collectionhttps://hdl.handle.net/2104/5505
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Browsing HIDPL Articles by Author "Donko, Zoltan"
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Item Crystallization Dynamics of a Single Layer Complex Plasma(Physical Review Letters, 2010-09) Hartmann, Peter; Douglass, Angela Michelle.; Carmona-Reyes, Jorge; Matthews, Lorin Swint.; Hyde, Truell Wayne.; Kovacs, Aniko Zs.; Donko, ZoltanWe report a series of complex (dusty) plasma experiments, aimed at the study of the detailed time evolution of the recrystallization process following a rapid quench of a two-dimensional dust liquid. The experiments were accompanied by large-scale (million-particle) molecular dynamics simulations, assuming Yukawa-type interparticle interaction. Both experiment and simulation show a t ^/alpha (power-law) dependence of the linear crystallite domain size as measured by the bond-order correlation length, translational correlation length, dislocation (defect) density, and a direct size measurement algorithm. The results show two stages of order formation. On short time scales, individual particle motion dominates; this is a fast process characterized by alpha = 0.93 +/- 0.1. At longer time scales, small crystallites undergo collective rearrangement, merging into bigger ones, resulting in a smaller exponent /alpha = 0.38 +/- 0.06.Item Self-diffusion in two-dimensional quasi-magnetized rotating dusty plasmas(Physical Review E, 2019-01-10) Hartmann, Peter; Reyes, J. C.; Kostadinova, Eva Georgieva, 1992-; Matthews, Lorin Swint.; Hyde, Truell Wayne.; Dzhumagulova, K. N.; Masheyeva, R. U.; Ramazanov, T. S.; Ott, T.; kahlert, H.; Bonitz, M.; Korolov, I.; Donko, ZoltanThe self-diffusion phenomenon in a two-dimensional dusty plasma at extremely strong (effective) magnetic fields is studied experimentally and by means of molecular dynamics simulations. In the experiment the high magnetic field is introduced by rotating the particle cloud and observing the particle trajectories in a corotating frame, which allows reaching effective magnetic fields up to 3000 T. The experimental results confirm the predictions of the simulations: (i) superdiffusive behavior is found at intermediate timescales and (ii) the dependence of the self-diffusion coefficient on the magnetic field is well reproduced.