Zero-field plasmon splitter: Controlled interaction between quantum anomalous Hall edge states
Abstract
The quantum anomalous Hall (QAH) effect provides chiral edge states without the need for an external magnetic field, but unlike in conventional quantum Hall systems, their trajectories cannot be readily controlled electrostatically. Here, we engineer Coulomb interactions between two spatially separated, counter-propagating QAH edge channels using a floating metallic island. Microwave measurements reveal frequency-dependent redistribution of injected edge plasmons between two output channels, demonstrating interaction-induced hybridization of the collective modes. A long-range interaction model quantitatively reproduces the response and reveals a very low plasmon velocity in the coupling region, strongly reduced by electrostatic screening. Our results establish engineered Coulomb coupling as a route to control collective excitations in QAH edge states and provide a building block for chiral plasmonic circuits and electron quantum optics in magnetic topological insulators.
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BibTeX
@misc{hoborka2026zerofield,
title = {{Zero-field plasmon splitter: Controlled interaction between quantum anomalous Hall edge states}},
author = {Dominik Hoborka and Torsten Röper and Fabian Hassler and Alexey A. Taskin and Yoichi Ando and Erwann Bocquillon},
howpublished = {arXiv},
year = {2026},
month = nov,
doi = {10.48550/arxiv.2611.02879},
eprint = {2611.02879},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2611.02879},
note = {CC BY 4.0},
}
RIS
TY - UNPB
TI - Zero-field plasmon splitter: Controlled interaction between quantum anomalous Hall edge states
AU - Dominik Hoborka
AU - Torsten Röper
AU - Fabian Hassler
AU - Alexey A. Taskin
AU - Yoichi Ando
AU - Erwann Bocquillon
PY - 2026
DA - 2026/11/02
PB - arXiv
DO - 10.48550/arxiv.2611.02879
UR - https://arxiv.org/abs/2611.02879
AB - The quantum anomalous Hall (QAH) effect provides chiral edge states without the need for an external magnetic field, but unlike in conventional quantum Hall systems, their trajectories cannot be readily controlled electrostatically. Here, we engineer Coulomb interactions between two spatially separated, counter-propagating QAH edge channels using a floating metallic island. Microwave measurements reveal frequency-dependent redistribution of injected edge plasmons between two output channels, demonstrating interaction-induced hybridization of the collective modes. A long-range interaction model quantitatively reproduces the response and reveals a very low plasmon velocity in the coupling region, strongly reduced by electrostatic screening. Our results establish engineered Coulomb coupling as a route to control collective excitations in QAH edge states and provide a building block for chiral plasmonic circuits and electron quantum optics in magnetic topological insulators.
ER -