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arXiv · 1910.08026

Coupled pair of one and two dimensional magneto-plasmons on electrons on helium

A. D. Chepelianskii·D. Papoular·H. Bouchiat·K. Kono
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Abstract

Electrons on the liquid helium surface form an extremely clean two dimensional system where different plasmon-excitations can coexist. Under a magnetic field time reversal symmetry is broken and all the bulk magneto-plasmons become gaped at frequencies below cyclotron resonance while chiral one dimensional edge magneto-plasmons appear at the system perimeter. We theoretically show that the presence of a homogeneous density gradient in the electron gas leads to the formation of a delocalized magneto-plasmon mode in the same frequency range as the lowest frequency edge-magnetoplasmon mode. We experimentally confirm its existence by measuring the corresponding resonance peak in frequency dependence of the admittance of the electron gas. This allows to realize a prototype system to investigate the coupling between a chiral one-dimensional mode and a single delocalized bulk mode. Such a model system can be important for the understanding of transport properties of topological materials where states of different dimensionality can coexist.

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A. D. Chepelianskii, D. Papoular, H. Bouchiat, K. Kono. 2019-10-17. Coupled pair of one and two dimensional magneto-plasmons on electrons on helium. https://doi.org/10.1103/physrevb.103.075420

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