Eur. Phys. J. B (2017) 90: 79
https://doi.org/10.1140/epjb/e2017-70627-5

Regular Article

Plasma excitation dispersion in non-degenerate quantum wire over liquid helium

¹ B. Verkin Institute for Low Temperature Physics and Engineering of the National Academy of Sciences of Ukraine, 47 Lenin ave., 61103 Kharkov, Ukraine
² Departamento de Física, Universidade Federal de São Carlos, via Washington Luís, km. 235, 13565-905 São Carlos, São Paulo, Brazil
³ Centro de Ciências Naturais e Humanas, Universidade Federal do ABC, Av. dos Estados, 5001, 09210-580, Santo André, São Paulo, Brazil

^a e-mail: n.studart@gmail.com

Received: 24 October 2016
Received in final form: 20 February 2017
Published online: 2 May 2017

Abstract

We calculate the dispersion laws of plasma oscillations for the quasi-one-dimensional multisubband non-degenerate charge system realized in a conducting electron channel over the surface of liquid helium. The influence on plasma dispersion from an external magnetic field is considered. A novel two-subband approach within the random-phase approximation is employed for both intra- and intersubband plasmons. Our results are compared with those obtained previously in quasi-crystalline approach; despite being qualitatively similar, there are quantitative differences, especially at high wave numbers.