Laser-excited dust lattice waves in plasma crystals

Homann, A.; Melzer, A.; Peters, Sebastian; Madani, R.; Piel, A.

doi:10.1016/s0375-9601(98)00141-8

Cited by 154 publications

(83 citation statements)

References 22 publications

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“…Of particular interest in 2D dusty plasmas are their collective and dynamical properties, such as longitudinal and transverse wave modes, which have been studied extensively over the past decade in experiments [7,8,9,10,11,12], theories [13,14,15,16,17,18,19], and numerical simulations [18,20,21]. On the experimental side, externally excited (longitudinal) dust lattice waves (DLWs) were first observed by Homann et al [7,8], who found their dispersion relation to be in good agreement with the theoretical prediction of Melandsø [14]. Next, thermally excited phonon spectrum in a 2D plasma crystal was observed in an experiment by Nunomura et al [9], who demonstrated a good agreement of this spectrum with theory [13,15,16] for both the longitudinal and transverse modes in the entire first Brillouin zone.…”

Section: Introductionmentioning

confidence: 99%

Wave spectra of two-dimensional dusty plasma solids and liquids

et al. 2009

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Brownian dynamics simulations were carried out to study wave spectra of two-dimensional dusty plasma liquids and solids for a wide range of wavelengths. The existence of a longitudinal dust thermal mode was confirmed in simulations, and a cutoff wavenumber in the transverse mode was measured. Dispersion relations, resulting from simulations, were compared with those from analytical theories, such as the random-phase approximation (RPA), quasi-localized charged approximation (QLCA), and harmonic approximation (HA). An overall good agreement between the QLCA and simulations was found for wide ranges of states and wavelengths after taking into account the direct thermal effect in the QLCA, while for the RPA and HA good agreement with simulations were found in the high and low temperature limits, respectively.

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Section: Introductionmentioning

confidence: 99%

Wave spectra of two-dimensional dusty plasma solids and liquids

et al. 2009

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“…Several laboratory experiments have determined that exciting particles in a shaped region [4][5][6][7] of the lattice can produce both longitudinal and transverse waves. In these experiments, particle excitation was created using a sinusoidally modulated laser beam.…”

Section: Introductionmentioning

confidence: 99%

Dispersion relations for thermally excited waves in plasma crystals

Qiao

Hyde

2003

J. Phys. A: Math. Gen.

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Thermally excited waves in a Plasma crystal were numerically simulated using a Box_Tree code. The code is a Barnes_Hut tree code proven effective in modeling systems composed of large numbers of particles. Interaction between individual particles was assumed to conform to a Yukawa potential. Particle charge, mass, density, Debye length and output data intervals are all adjustable parameters in the code. Employing a Fourier transform on the output data, dispersion relations for both longitudinal and transverse wave modes were determined. These were compared with the dispersion relations obtained from experiment as well as a theory based on a harmonic approximation to the potential. They were found to agree over a range of 0.9<κ<5, where κ is the shielding parameter, defined by the ratio between interparticle distance a and dust Debye length λ D . This is an improvement over experimental data as current experiments can only verify the theory up to κ = 1.5.

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“…In our experiment, instead of planar plates we used laser manipulation [23,27,[29][30][31][32][33] of the dust particles In our data analysis, we exploit the symmetry of the experiment, and divide the region of interest into 89 long narrow rectangular bins, with one example bin shown in (b). The particle data are converted to continuum data by averaging data for individual particles in each bin.…”

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Observation of Temperature Peaks due to Strong Viscous Heating in a Dusty Plasma Flow

2012

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Profound temperature peaks are observed in regions of high velocity shear in a 2D dusty plasma experiment with laser-driven flow. These are attributed to viscous heating, which occurs due to collisional scattering in a shear flow. Using measurements of viscosity, thermal conductivity, and spatial profiles of flow velocity and temperature, we determine three dimensionless numbers: Brinkman Br = 0.5, Prandtl Pr = 0.09, and Eckert Ec = 5.7. The large value of Br indicates significant viscous heating that is consistent with the observed temperature peaks.

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Laser-excited dust lattice waves in plasma crystals

Cited by 154 publications

References 22 publications

Wave spectra of two-dimensional dusty plasma solids and liquids

Wave spectra of two-dimensional dusty plasma solids and liquids

Dispersion relations for thermally excited waves in plasma crystals

Observation of Temperature Peaks due to Strong Viscous Heating in a Dusty Plasma Flow

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