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Half-Mirror for Electrons in Quantum Hall Copropagating Edge Channels in a Mach-Zehnder Interferometer

Takase Shimizu, Jun-ichiro Ohe

2023enquantumelectronscoherenceinterferometerdevices

Abstract

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This study presents a half-mirror that effectively divides spin-polarized electrons into two parallel copropagating spin-resolved quantum Hall edge channels. The objective was to investigate the coherence of the partition process, which was confirmed through the observation of Aharonov-Bohm oscillation with high visibility, reaching up to 85%, in a Mach-Zehnder interferometer that incorporates two such half-mirrors. The interferometer’s coherence length was found to exceed 200 µm, indicating the robust resilience of copropagating channels against environmental decoherence. Furthermore, the stability of device characteristics suggests significant promise for applications in quantum information processing. A theoretical model was developed for the beam-splitting process, and numerical simulations successfully replicated the experimental observations. Additionally, the partitioning of electrons was shown to involve spin rotation, elucidated through the concept of angular momentum transfer from orbital to spin states via spin-orbit interactions.

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Cite This Work

@article{b7a987a0-6be8-4568-a42b-4255006eb94a,
  title={Half-Mirror for Electrons in Quantum Hall Copropagating Edge Channels in a Mach-Zehnder Interferometer},
  author={Takase Shimizu and Jun-ichiro Ohe},
  year={2023},
  language={en}
}
TY  - JOUR
TI  - Half-Mirror for Electrons in Quantum Hall Copropagating Edge Channels in a Mach-Zehnder Interferometer
AU  - Takase Shimizu
AU  - Jun-ichiro Ohe
PY  - 2023
LA  - en
ER  -

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