Collective excitations of a spherically confined Yukawa plasma

Kählert, H.; Bönitz, M.

doi:10.1103/physreve.83.056401

Cited by 16 publications

(33 citation statements)

References 39 publications

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“…is still much smaller than the size σ of the plasma, so that the cold fluid assumption provides a good description of the dominant mechanism of energy absorption. A cold fluid analysis of the eigenmodes of finite plasmas [45] has been successfully applied, e.g., to confined non-neutral ion plasmas [46][47][48][49] and more recently to spherically confined complex plasmas [50,51].…”

Section: Cold Fluid Theorymentioning

confidence: 99%

Collective energy absorption of ultracold plasmas through electronic edge-modes

2012

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Abstract. We investigate the collective dynamics of electrons in ultracold neutral plasmas driven by an oscillating radio-frequency field. We point out the importance of a sharp density drop at the plasma boundary that arises due to unavoidable charge imbalances, and show that this plasma edge provides the major mechanism for energy absorption from the external field. Using a cold fluid theory, we derive the corresponding absorption frequency and validate our findings by microscopic molecular dynamics simulations. The proposed edgemode is shown to provide a consistent explanation for the observed absorption spectra measured in different experiments. Understanding the response of the electronic plasma component to weak external driving is essential since it grants experimental access to the time-evolving density and temperature of ultracold plasmas. Contents

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Section: Cold Fluid Theorymentioning

confidence: 99%

Collective energy absorption of ultracold plasmas through electronic edge-modes

2012

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“…In the final step, we simply relabel the summation indices and use the definition of the strain tensor, see below Eq. (11). With the help of Eqs.…”

Section: A Appendix: Calculation Of Local Equationsmentioning

confidence: 99%

“…It has been shown both experimentally [6,8,9] and by simulations and theory [10][11][12][13] that the collective modes of a finite system strongly differ from those of the corresponding bulk material. The theoretical calculation of the excitation spectrum for mesoscopic systems becomes particularly challenging if correlation effects are to be included.…”

Section: Introductionmentioning

confidence: 99%

Linear Fluid Theory for Weakly Inhomogeneous Plasmas with Strong Correlations

Kählert

Kalman

Bönitz

2015

Contrib. Plasma Phys.

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Linearized fluid equations for the collective modes of weakly inhomogeneous plasmas including strong coupling effects are derived from a recent kinetic theory based on an extended Singwi-Tosi-Land-Sjölander (STLS) ansatz [H. Kählert, G. J. Kalman, and M. Bonitz, Phys. Rev. E 90, 011101(R) (2014)]. The equations are analogous to the equations of linearized elasticity theory with space dependent elastic moduli that correspond to those of a bulk system with the local fluid density. The identification of the latter as infinite-frequency elastic moduli shows that the present version of the extended STLS theory accounts for the elastic properties of the fluid but does not capture the viscous behavior.

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“…Kählert and Bonitz [8,37] treated the Yukawa cluster as a fluid droplet and derived the modes by solving the plasma fluid equations. In their approach, the total potential of the dust cloud with time-dependent density n d ( r , t) is expanded into a set of radial and angular eigenfunctions.…”

Section: Fluid Modes Analysismentioning

confidence: 99%

“…A different, recently developed approach has been proposed by Kählert and Bonitz [8,37]. They have treated the Yukawa ball similar to a fluid droplet, deriving the fluid modes of a 3D dust cluster from a cold fluid plasma description.…”

Section: Introductionmentioning

confidence: 99%

Crystal and fluid modes in three-dimensional finite dust clouds

et al. 2013

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The spectral properties of three-dimensional dust clusters confined in gaseous discharges are investigated using both a fluid mode description and the normal mode analysis (NMA). The modes are analysed for crystalline clusters as well as for laser-heated fluid-like clusters. It is shown that even for clusters with low particle numbers and under presence of damping fluid modes can be identified. Laser-heating leads to the excitation of several, mainly transverse, modes. The mode frequencies are found to be nearly independent of the coupling parameter and support the predictions of the underlying theory. The NMA and the fluid mode spectra demonstrate that the wakefield attraction is present for the experimentally observed Yukawa balls at low pressure. Both methods complement each other, since NMA is more suitable for crystalline clusters, whereas the fluid modes allow to explore even fluid-like dust clouds.

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Collective excitations of a spherically confined Yukawa plasma

Cited by 16 publications

References 39 publications

Collective energy absorption of ultracold plasmas through electronic edge-modes

Collective energy absorption of ultracold plasmas through electronic edge-modes

Linear Fluid Theory for Weakly Inhomogeneous Plasmas with Strong Correlations

Crystal and fluid modes in three-dimensional finite dust clouds

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