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

研究成果: Contribution to journalArticle査読

抄録

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 frequency 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 observed 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 manifestation of the nearly incompressible feature of strongly interacting classical electrons, which agrees with earlier theoretical predictions.

本文言語英語
論文番号004310LTP
ジャーナルLow Temperature Physics
39
10
DOI
出版ステータス出版済み - 10 2013

All Science Journal Classification (ASJC) codes

  • 物理学および天文学(その他)

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