Oscillation mode transformation of edge magnetoplasmons in two-dimensional electron system on liquid-helium surface

Shuji Yamanaka, Toshikazu Arai, Anju Sawada, Akira Fukuda, Hideki Yayama

Research output: Contribution to journalArticle

Abstract

We measured the resonance spectra of edge magnetoplasmon (EMP) oscillations in a two-dimensional (2D) electron system located on a liquid-helium surface below 1.1 K. Systematic measurements of the resonance fre-quency and the damping rate as a function of the lateral confinement electric field strength shows clear evidence of the oscillation mode transformation. A pronounced change corresponding to the mode transformation was ob-served in the damping rate. When 2D electrons are confined in a strong lateral electric field, the damping is weak. As the lateral confinement electric field is reduced below a certain threshold value, an abrupt enhancement of the damping rate is observed. We hypothesize that the weak damping mode in the strong lateral confinement electric field is the compressive density oscillation of the electrons near the edge (conventional EMP) and the strong damping mode in the weak confinement field is the coupled mode of conventional EMP and the boundary displacement wave (BDW). The observation of the strong damping in the BDW-EMP coupled mode is a ma-nifestation of the nearly incompressible feature of strongly interacting classical electrons, which agrees with ear-lier theoretical predictions.

Original languageEnglish
Pages (from-to)1086-1095
Number of pages10
JournalFizika Nizkikh Temperatur
Volume39
Issue number10
Publication statusPublished - Oct 1 2013

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

Fingerprint Dive into the research topics of 'Oscillation mode transformation of edge magnetoplasmons in two-dimensional electron system on liquid-helium surface'. Together they form a unique fingerprint.

  • Cite this