Coupled pair of one and two dimensional magneto-plasmons on electrons on helium
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.
Keywords
Cite
@article{arxiv.1910.08026,
title = {Coupled pair of one and two dimensional magneto-plasmons on electrons on helium},
author = {A. D. Chepelianskii and D. Papoular and H. Bouchiat and K. Kono},
journal= {arXiv preprint arXiv:1910.08026},
year = {2021}
}