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Hartmann P, Reyes JC, Kostadinova EG, Matthews LS, Hyde TW, Masheyeva RU, Dzhumagulova KN, Ramazanov TS, Ott T, Kählert H, Bonitz M, Korolov I, Donkó Z. Self-diffusion in two-dimensional quasimagnetized rotating dusty plasmas. Phys Rev E 2019; 99:013203. [PMID: 30780312 DOI: 10.1103/physreve.99.013203] [Citation(s) in RCA: 21] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/29/2018] [Indexed: 11/07/2022]
Abstract
The 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.
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Affiliation(s)
- P Hartmann
- Institute for Solid State Physics and Optics, Wigner Research Centre, Hungarian Academy of Sciences, P.O. Box 49, H-1525 Budapest, Hungary.,Center for Astrophysics, Space Physics, and Engineering Research (CASPER), One Bear Place 97283, Baylor University, Waco, Texas 76798, USA
| | - J C Reyes
- Center for Astrophysics, Space Physics, and Engineering Research (CASPER), One Bear Place 97283, Baylor University, Waco, Texas 76798, USA
| | - E G Kostadinova
- Center for Astrophysics, Space Physics, and Engineering Research (CASPER), One Bear Place 97283, Baylor University, Waco, Texas 76798, USA
| | - L S Matthews
- Center for Astrophysics, Space Physics, and Engineering Research (CASPER), One Bear Place 97283, Baylor University, Waco, Texas 76798, USA
| | - T W Hyde
- Center for Astrophysics, Space Physics, and Engineering Research (CASPER), One Bear Place 97283, Baylor University, Waco, Texas 76798, USA
| | - R U Masheyeva
- IETP, Al Farabi Kazakh National University, 71 al Farabi Avenue, Almaty 050040, Kazakhstan
| | - K N Dzhumagulova
- IETP, Al Farabi Kazakh National University, 71 al Farabi Avenue, Almaty 050040, Kazakhstan
| | - T S Ramazanov
- IETP, Al Farabi Kazakh National University, 71 al Farabi Avenue, Almaty 050040, Kazakhstan
| | - T Ott
- Institute for Theoretical Physics and Astrophysics, Christian-Albrechts-University Kiel, Leibnizstrasse 15, 24098 Kiel, Germany
| | - H Kählert
- Institute for Theoretical Physics and Astrophysics, Christian-Albrechts-University Kiel, Leibnizstrasse 15, 24098 Kiel, Germany
| | - M Bonitz
- Institute for Theoretical Physics and Astrophysics, Christian-Albrechts-University Kiel, Leibnizstrasse 15, 24098 Kiel, Germany
| | - I Korolov
- Institute for Solid State Physics and Optics, Wigner Research Centre, Hungarian Academy of Sciences, P.O. Box 49, H-1525 Budapest, Hungary
| | - Z Donkó
- Institute for Solid State Physics and Optics, Wigner Research Centre, Hungarian Academy of Sciences, P.O. Box 49, H-1525 Budapest, Hungary
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Tadsen B, Greiner F, Piel A. Probing a dusty magnetized plasma with self-excited dust-density waves. Phys Rev E 2018; 97:033203. [PMID: 29776141 DOI: 10.1103/physreve.97.033203] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2017] [Indexed: 06/08/2023]
Abstract
A cloud of nanodust particles is created in a reactive argon-acetylene plasma. It is then transformed into a dusty magnetized argon plasma. Plasma parameters are obtained with the dust-density wave diagnostic introduced by Tadsen et al. [Phys. Plasmas 22, 113701 (2015)10.1063/1.4934927]. A change from an open to a cylindrically enclosed nanodust cloud, which was observed earlier, can now be explained by a stronger electric confinement if a vertical magnetic field is present. Using two-dimensional extinction measurements and the inverse Abel transform to determine the dust density, a redistribution of the dust with increasing magnetic induction is found. The dust-density profile changes from being peaked around the central void to being peaked at an outer torus ring resulting in a hollow profile. As the plasma parameters cannot explain this behavior, we propose a rotation of the nanodust cloud in the magnetized plasma as the origin of the modified profile.
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Affiliation(s)
| | - Franko Greiner
- IEAP, Christian-Albrechts-Universität, 24098 Kiel, Germany
| | - Alexander Piel
- IEAP, Christian-Albrechts-Universität, 24098 Kiel, Germany
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Ott T, Bonitz M, Hartmann P, Donkó Z. Spontaneous generation of temperature anisotropy in a strongly coupled magnetized plasma. Phys Rev E 2017; 95:013209. [PMID: 28208314 DOI: 10.1103/physreve.95.013209] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/19/2016] [Indexed: 06/06/2023]
Abstract
A magnetic field was recently shown to enhance field-parallel heat conduction in a strongly correlated plasma whereas cross-field conduction is reduced. Here we show that in such plasmas, the magnetic field has the additional effect of inhibiting the isotropization process between field-parallel and cross-field temperature components, thus leading to the emergence of strong and long-lived temperature anisotropies when the plasma is locally perturbed. An extended heat equation is shown to describe this process accurately.
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Affiliation(s)
- T Ott
- Christian-Albrechts-University Kiel, Institute for Theoretical Physics and Astrophysics, Leibnizstraße 15, 24098 Kiel, Germany
| | - M Bonitz
- Christian-Albrechts-University Kiel, Institute for Theoretical Physics and Astrophysics, Leibnizstraße 15, 24098 Kiel, Germany
| | - P Hartmann
- Institute for Solid State Physics and Optics, Wigner Research Centre for Physics, P.O. Box 49, H-1525 Budapest, Hungary
| | - Z Donkó
- Institute for Solid State Physics and Optics, Wigner Research Centre for Physics, P.O. Box 49, H-1525 Budapest, Hungary
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Dzhumagulova KN, Masheyeva RU, Ott T, Hartmann P, Ramazanov TS, Bonitz M, Donkó Z. Cage correlation and diffusion in strongly coupled three-dimensional Yukawa systems in magnetic fields. Phys Rev E 2016; 93:063209. [PMID: 27415379 DOI: 10.1103/physreve.93.063209] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/25/2016] [Indexed: 06/06/2023]
Abstract
The influence of an external homogeneous magnetic field on the quasilocalization of the particles-characterized quantitatively by cage correlation functions-in strongly coupled three-dimensional Yukawa systems is investigated via molecular dynamics computer simulations over a wide domain of the system parameters (coupling and screening strengths, and magnetic field). The caging time is found to be enhanced by the magnetic field B. The anisotropic migration of the particles in the presence of magnetic field is quantified via computing directional correlation functions, which indicate a more significant increase of localization in the direction perpendicular to B, while a moderate increase is also found along the B field lines. Associating the particles' escapes from the cages with jumps of a characteristic length, a connection is found with the diffusion process: the diffusion coefficients derived from the decay time of the directional correlation functions in both the directions perpendicular to and parallel with B are in very good agreement with respective diffusion coefficients values obtained from their usual computation based on the mean-squared displacement of the particles.
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Affiliation(s)
- K N Dzhumagulova
- IETP, Al Farabi Kazakh National University, 71, al Farabi Avenue, Almaty, 050040, Kazakhstan
| | - R U Masheyeva
- IETP, Al Farabi Kazakh National University, 71, al Farabi Avenue, Almaty, 050040, Kazakhstan
| | - T Ott
- Institute for Theoretical Physics and Astrophysics, Christian-Albrechts-University Kiel, Leibnizstrasse 15, 24098 Kiel, Germany
| | - P Hartmann
- Institute for Solid State Physics and Optics, Wigner Research Centre for Physics, Hungarian Academy of Sciences, H-1121 Budapest, Konkoly-Thege Miklós Street 29-33, Hungary
| | - T S Ramazanov
- IETP, Al Farabi Kazakh National University, 71, al Farabi Avenue, Almaty, 050040, Kazakhstan
| | - M Bonitz
- Institute for Theoretical Physics and Astrophysics, Christian-Albrechts-University Kiel, Leibnizstrasse 15, 24098 Kiel, Germany
| | - Z Donkó
- Institute for Solid State Physics and Optics, Wigner Research Centre for Physics, Hungarian Academy of Sciences, H-1121 Budapest, Konkoly-Thege Miklós Street 29-33, Hungary
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Ott T, Bonitz M, Donkó Z. Effect of correlations on heat transport in a magnetized strongly coupled plasma. PHYSICAL REVIEW. E, STATISTICAL, NONLINEAR, AND SOFT MATTER PHYSICS 2015; 92:063105. [PMID: 26764836 DOI: 10.1103/physreve.92.063105] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/10/2015] [Indexed: 06/05/2023]
Abstract
In a classical ideal plasma, a magnetic field is known to reduce the heat conductivity perpendicular to the field, whereas it does not alter the one along the field. Here we show that, in strongly correlated plasmas that are observed at high pressure and/or low temperature, a magnetic field reduces the perpendicular heat transport much less and even enhances the parallel transport. These surprising observations are explained by the competition of kinetic, potential, and collisional contributions to the heat conductivity. Our results are based on first-principle molecular dynamics simulations of a one-component plasma.
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Affiliation(s)
- T Ott
- Christian-Albrechts-University Kiel, Institute for Theoretical Physics and Astrophysics, Leibnizstraße 15, 24098 Kiel, Germany
| | - M Bonitz
- Christian-Albrechts-University Kiel, Institute for Theoretical Physics and Astrophysics, Leibnizstraße 15, 24098 Kiel, Germany
| | - Z Donkó
- Institute for Solid State Physics and Optics, Wigner Research Centre for Physics, Hungarian Academy of Sciences, H-1525 Budapest, P.O.B 49, Hungary
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Ott T, Löwen H, Bonitz M. Dynamics of two-dimensional one-component and binary Yukawa systems in a magnetic field. PHYSICAL REVIEW. E, STATISTICAL, NONLINEAR, AND SOFT MATTER PHYSICS 2014; 89:013105. [PMID: 24580344 DOI: 10.1103/physreve.89.013105] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/04/2013] [Indexed: 06/03/2023]
Abstract
We consider two-dimensional Yukawa systems in a perpendicular magnetic field. Computer simulations of both one-component and binary systems are used to explore the equilibrium particle dynamics in the fluid state. The mobility is found to scale with the inverse of the magnetic field strength (Bohm diffusion), for strong fields (ωc/ωp≳1). For bidisperse mixtures, the magnetic field dependence of the long-time mobility depends on the particle species, providing an external control of their mobility ratio. At large magnetic fields, the highly charged particles are almost immobilized by the magnetic field and form a porous matrix of obstacles for the mobile low-charge particles.
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Affiliation(s)
- T Ott
- Institut für Theoretische Physik II: Weiche Materie, Heinrich-Heine-Universität Düsseldorf, Universitätsstraße 1, D-40225 Düsseldorf, Germany and Institut für Theoretische Physik und Astrophysik, Christian-Albrechts-Universität zu Kiel, Leibnizstraße 15, 24098 Kiel, Germany
| | - H Löwen
- Institut für Theoretische Physik II: Weiche Materie, Heinrich-Heine-Universität Düsseldorf, Universitätsstraße 1, D-40225 Düsseldorf, Germany
| | - M Bonitz
- Institut für Theoretische Physik und Astrophysik, Christian-Albrechts-Universität zu Kiel, Leibnizstraße 15, 24098 Kiel, Germany
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Hartmann P, Donkó Z, Ott T, Kählert H, Bonitz M. Magnetoplasmons in rotating dusty plasmas. PHYSICAL REVIEW LETTERS 2013; 111:155002. [PMID: 24160606 DOI: 10.1103/physrevlett.111.155002] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/17/2013] [Indexed: 06/02/2023]
Abstract
A rotating dusty plasma apparatus was constructed to provide the possibility of experimental emulation of extremely high magnetic fields by means of the Coriolis force, observable in a corotating measurement frame. We present collective excitation spectra for different rotation rates with a magnetic induction equivalent of up to 3200 T. We identify the onset of magnetoplasmon-equivalent mode dispersion in the rotating macroscopic two-dimensional single-layer dusty plasma. The experimental results are supported by molecular dynamics simulations of 2D magnetized Yukawa systems.
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Affiliation(s)
- Peter Hartmann
- Institute for Solid State Physics and Optics, Wigner Research Centre for Physics, Hungarian Academy of Sciences, H-1121 Budapest, Konkoly-Thege Miklós street 29-33, Hungary and Center for Astrophysics, Space Physics and Engineering Research (CASPER), One Bear Place 97310, Baylor University, Waco, Texas 76798, USA
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