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Localizing individual exciton on a quantum Hall antidot
Rui Pu1, Naomi Mizuno1, Fernando Camino2
1Department of Physics and Astronomy, Stony Brook University, Stony Brook, NY, USA.
Nature Communications
|November 24, 2025
Summary
Researchers created tunable quantum Hall quasiparticle excitons using quantum Hall antidots. These coherent electron-hole states pave the way for novel quantum devices and systems.
Area of Science:
- Condensed Matter Physics
- Quantum Information Science
Background:
- Excitons, electron-hole pairs, are crucial in semiconductors and quantum Hall systems.
- Previous research focused on bulk systems, limiting applications in quantum devices.
Purpose of the Study:
- To demonstrate a localized, electrically tunable quantum Hall quasiparticle exciton.
- To explore the quantum-coherent dynamics of individual excitons.
Main Methods:
- Utilizing a quantum Hall antidot with two spatially separated edge channels.
- Investigating gate-dependence of antidot conductance peaks near resonance.
- Modeling the exciton as a coupled two-level system.
Main Results:
- Demonstrated a quantum-coherent bound state of electron and hole on separate edges.
- Observed quantum-coherent exciton dynamics, indicating superposition of states.
- Achieved semi-quantitative understanding of experimental results via modeling.
Conclusions:
- This work enables localization and electrical tuning of individual quantum Hall excitons.
- Opens new possibilities for creating quantum systems with multiple quasiparticles.
- Advances the development of quantum devices based on excitonic phases.
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