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Mode coupling in two-dimensional complex plasma crystals

Nosenko, Volodymyr and Meyer, John and Laut, Ingo and Zhdanov, Sergey and Thomas, Hubertus M. (2018) Mode coupling in two-dimensional complex plasma crystals. 45th European Physical Society Conference on Plasma Physics, 2-6 July 2018, Prague, Czech Republic. (Unpublished)

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Abstract

Wave modes of many physical systems can become coupled to each other. Mode coupling can lead to new interesting effects such as the mode-coupling instability (MCI) which was predicted theoretically and observed experimentally in two-dimensional (2D) complex plasma crystals. MCI occurs when the dispersion relations of the two dust-lattice wave modes, longitudinal in-plane (L) mode and transverse vertical (TV) mode intersect. In the vicinity of their intersection, a new hybrid mode appears which is unstable. If not suppressed by the neutral gas friction, it will grow exponentially with time and can result in the crystal melting. A prominent characteristic feature of MCI is mixed polarization, where traces of the L mode can be measured in the transverse vertical spectra and vice versa. It was previously believed that the mixed polarization could only be observed in the presence of mode crossing. In this contribution, we report on the experimental observation of mode coupling and mixed polarization of the longitudinal in-plane and transverse vertical wave modes in a 2D complex plasma crystal in the absence of mode crossing. The coupling manifests itself in traces of the TV mode appearing in the measured longitudinal spectra. The observations are corroborated in molecular dynamics simulations. A theoretical analysis of the modes in a plasma crystal with finite temperature predicts the ratio of the trace to the principal mode which is in a good agreement with the experiment and simulations.

Item URL in elib:https://elib.dlr.de/122490/
Document Type:Conference or Workshop Item (Speech)
Title:Mode coupling in two-dimensional complex plasma crystals
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Nosenko, VolodymyrV.Nosenko (at) dlr.deUNSPECIFIED
Meyer, JohnJohn.Meyer (at) dlr.deUNSPECIFIED
Laut, IngoIngo.Laut (at) dlr.deUNSPECIFIED
Zhdanov, SergeySergey.Zhdanov (at) dlr.deUNSPECIFIED
Thomas, Hubertus M.Hubertus.Thomas (at) dlr.dehttps://orcid.org/0000-0001-8358-2023
Date:5 July 2018
Refereed publication:No
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Status:Unpublished
Keywords:complex plasma, mode-coupling instability
Event Title:45th European Physical Society Conference on Plasma Physics
Event Location:Prague, Czech Republic
Event Type:international Conference
Event Dates:2-6 July 2018
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Research under Space Conditions
DLR - Research area:Raumfahrt
DLR - Program:R FR - Forschung unter Weltraumbedingungen
DLR - Research theme (Project):R - Komplexe Plasmen / Laboratory research
Location: Oberpfaffenhofen
Institutes and Institutions:Institute of Materials Physics in Space > Research Group Complex Plasma
Deposited By: Nosenko, Volodymyr
Deposited On:29 Oct 2018 08:40
Last Modified:28 Mar 2019 08:54

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