Microphysics of liquid complex plasmas in equilibrium and non-equilibrium systems

The dynamic evolution of the microscopic structure of solid and liquid phases of complex plasmas is studied experimentally and by means of molecular dynamics (MD) simulations. In small finite systems, the cooperative motion can be described in terms of discrete modes. These modes are studied with di...

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Bibliographic Details
Published in:The European physical journal. D, Atomic, molecular, and optical physics Atomic, molecular, and optical physics, 2018-05, Vol.72 (5), p.1-9, Article 80
Main Authors: Piel, Alexander, Block, Dietmar, Melzer, André, Mulsow, Matthias, Schablinski, Jan, Schella, André, Wieben, Frank, Wilms, Jochen
Format: Article
Language:English
Subjects:
Applications of Nonlinear Dynamics and Chaos Theory
Atomic
Incompressibility
Lasers
Liquid phases
Microphysics
Molecular
Molecular chains
Molecular dynamics
Optical and Plasma Physics
Physical Chemistry
Physics
Physics and Astronomy
Plasmas (physics)
Potential energy
Quantum Information Technology
Quantum Physics
Regular Article
Spectroscopy/Spectrometry
Spintronics
Topical Issue: Fundamentals of Complex Plasmas
Two dimensional analysis
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Summary:The dynamic evolution of the microscopic structure of solid and liquid phases of complex plasmas is studied experimentally and by means of molecular dynamics (MD) simulations. In small finite systems, the cooperative motion can be described in terms of discrete modes. These modes are studied with different experimental approaches. Using diffuse scattered laser light, applying laser tweezer forces to individual particles, and periodic laser pulses, the excitation of modes is investigated. The instantaneous normal mode analysis of experimental data from two-dimensional liquid clusters gives access to the local dynamics of the liquid phase. Our investigations shed light on the role of compressional and shear modes as well as the determination of diffusion constants and melting temperatures in finite systems. Special attention is paid to hydrodynamic situations with a stationary inhomogeneous dust flow. MD simulations allow to study the collective motion in the shell of nearest neighbors, which can be linked to smooth and sudden changes of the macroscopic flow. Finally, the observed micro-motion in all situations above allows to shed light on the preference of shear-like over compressional motion in terms of a minimized potential energy and a dynamic incompressibility. Graphical abstract
ISSN:1434-6060
1434-6079
DOI:10.1140/epjd/e2017-80371-7