Localizing individual exciton on a quantum Hall antidot

Rui Pu, Naomi Mizuno, Fernando Camino, Runchen Li, Kenji Watanabe, Takashi Taniguchi, Dmitri Averin () and Xu Du ()
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Rui Pu: Stony Brook University, Department of Physics and Astronomy
Naomi Mizuno: Stony Brook University, Department of Physics and Astronomy
Fernando Camino: Brookhaven National Laboratory, Center for Functional Nanomaterials
Runchen Li: Stony Brook University, Department of Physics and Astronomy
Kenji Watanabe: National Institute for Materials Science, Research Center for Electronic and Optical Materials
Takashi Taniguchi: National Institute for Materials Science, Research Center for Materials Nanoarchitectonics
Dmitri Averin: Stony Brook University, Department of Physics and Astronomy
Xu Du: Stony Brook University, Department of Physics and Astronomy

Nature Communications, 2025, vol. 16, issue 1, 1-10

Abstract: Abstract Excitons are bond states of electron-hole pairs formed through Coulomb interaction. While excitonic phases have been widely studied in semiconductors and quantum Hall double-layers, prior works largely focus on bulk systems with large number of excitons, limiting their applications in quantum devices. Here, employing the approach of quantum Hall antidot with two spatially separated edge channels, we demonstrate a type of quantum Hall quasiparticle exciton which represents a quantum-coherent bound state of an electron and a hole situated on their corresponding edges coupled through intralayer tunneling and Coulomb interaction. This approach allows localization and electrical tuning of individual quantum Hall excitons. Quantum-coherent dynamics of exciton are observed in the gate-dependence of antidot conductance peaks near the electron-hole resonance, which signifies a quantum superposition of vacuum- and electron-hole pairing states. Modeling the electron-hole pair as a coupled two-level system, semi-quantitative understanding of experimental observations is achieved. This work opens avenues for creating quantum systems of multiple quantum Hall quasiparticles.

Date: 2025
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DOI: 10.1038/s41467-025-65369-9

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