Collective oscillations of a two-chain electron system in a conducting channel over liquid helium

The simulation of a low-dimensional electron system over liquid helium was performed. It was shown that inclusion of an additional potential acting in the plane of the charge sheet leads to compression of the system in the direction of the external force. Such a potential arises in experiment when a...

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Veröffentlicht in:Low temperature physics (Woodbury, N.Y.) N.Y.), 2015-11, Vol.41 (11), p.858-866
Hauptverfasser: Syvokon, V. E., Sokolov, S. S.
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Sprache:eng
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Zusammenfassung:The simulation of a low-dimensional electron system over liquid helium was performed. It was shown that inclusion of an additional potential acting in the plane of the charge sheet leads to compression of the system in the direction of the external force. Such a potential arises in experiment when a system of surface electrons is formed over a profiled substrate where the potential is proportional to the holding electric field. It was found that in this case the system passes sequentially through the configurations consisting of several linear chains and undergoes a transition from the state of two-dimensional electron crystal to the zigzag configuration earlier predicted by Chaplik. With further increase in the holding field, the system becomes a single linear chain. The dispersion relations for the collective plasma oscillations of the zigzag configuration of electrons were calculated by the method of the equations of motion. It was found that one of the longitudinal oscillation modes is acoustic, whiles the other is optical. Both transverse oscillation modes were found to be optical. The results were compared with the dispersion relations earlier obtained for a single chain of electrons. It was shown that the dispersion relations of transverse plasma oscillations are more stable than the transverse mode of the oscillations of a single chain. The influence of magnetic field on the spectrum of plasma oscillations of the zigzag configuration of electrons was studied.
ISSN:1063-777X
1090-6517
DOI:10.1063/1.4935689