Fizika Nizkikh Temperatur: Volume 43, Number 9 (September 2017), p. 1303-1315    ( to contents , go back )

Surface electrons over liquid helium in a narrow channel. Modeling of the current processes

V.E. Syvokon and I.V. Sharapova

B. Verkin Institute for Low Temperature Physics and Engineering of the National Academy of Sciences of Ukraine 47 Lenin Ave., Kharkov 61103, Ukraine
E-mail: sivokon@ilt.kharkov.ua

Received December 5, 2016

Abstract

Modeling of electric current in the spatially ordered system of surface electrons over liquid helium (Wigner crystal) in a narrow channel are performed by the molecular dynamics method. It is shown that electric field, applied to the electron system under measurements can result in the essential spatial rearrangement of the electrons. The rearrangement yields the measured electric current. It is shown that under certain conditions the electrons can leave the channel overcoming an energy barrier. That leads to the current spikes. As a result of comparison our results with the published experimental data we conclude that ob-served phenomena are due to electron-electron interaction and external electric fields, mainly and do not rely to features of the electron–ripplon interaction.

PACS: 73.20.Qt Electron solids;
PACS: 73.20.–r Electron states at surfaces and interfaces;
PACS: 31.15.xv Molecular dynamics and other numerical methods.

Key words: Wigner crystal, two-dimensional system, current processes, liquid helium, molecular dynamics method.

Published online: July 25, 2017

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