Power of Axion Microwave Absorbed by Quantum Hall State in Haloscope
Abstract
We propose a new method for detecting dark matter axions using a resonant cavity coupled to a two-dimensional electron system in the quantum Hall regime. When the cavity is tuned to the axion frequency, the axion-induced electromagnetic field is resonantly enhanced and drives a transverse Hall current in the quantum Hall system. On a quantum Hall plateau, the longitudinal dissipative response is strongly suppressed, Re(σxx)≃0, while the Hall conductivity remains finite and quantized, Re(σxy)=νe2/h. Consequently, the Hall current is essentially nondissipative and introduces only a small additional loss to the cavity, allowing the loaded quality factor to approach the unloaded value, QL≃ Q0. The resulting Hall current is therefore enhanced by the large cavity quality factor, IH∝Re(σxy)E∝ QL. For a 2D electron density of 3×1011cm−2, filling factor ν=2, and QL∼105--106, we estimate a Hall current of order IH∼10−13--10−12A for an axion mass ma∼10−5eV and a magnetic field ∼ 5× 104G. The current is more enhanced by increasing the size of 2D electrons keeping the strength of magnetic field. Under the assumed thermal-noise level and readout conditions, the estimated Hall-current signal can achieve a signal-to-noise ratio greater than unity for an observation time of order 100s. The proposed method exploits the unique combination of a finite, quantized transverse response and a strongly suppressed longitudinal dissipation in the quantum Hall state, providing an alternative to conventional metallic-antenna detection in axion haloscopes.
Related
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- Photon-Counting Readout via Electro-Optic Microwave-to-Optical Transduction for Axion Haloscopes
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- Microwave Power-to-Frequency Transduction in a Magnetically Initiated Rydberg Dissipative Time Crystal
BibTeX
@misc{iwazaki2026power,
title = {{Power of Axion Microwave Absorbed by Quantum Hall State in Haloscope}},
author = {Aiichi Iwazaki},
howpublished = {arXiv},
year = {2026},
month = oct,
doi = {10.48550/arxiv.2607.19888},
eprint = {2607.19888},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2607.19888},
note = {CC BY 4.0},
}
RIS
TY - UNPB
TI - Power of Axion Microwave Absorbed by Quantum Hall State in Haloscope
AU - Aiichi Iwazaki
PY - 2026
DA - 2026/10/07
PB - arXiv
DO - 10.48550/arxiv.2607.19888
UR - https://arxiv.org/abs/2607.19888
AB - We propose a new method for detecting dark matter axions using a resonant cavity coupled to a two-dimensional electron system in the quantum Hall regime. When the cavity is tuned to the axion frequency, the axion-induced electromagnetic field is resonantly enhanced and drives a transverse Hall current in the quantum Hall system. On a quantum Hall plateau, the longitudinal dissipative response is strongly suppressed, Re(σ_xx)≃0, while the Hall conductivity remains finite and quantized, Re(σ_xy)=νe^2/h. Consequently, the Hall current is essentially nondissipative and introduces only a small additional loss to the cavity, allowing the loaded quality factor to approach the unloaded value, Q_L≃ Q_0. The resulting Hall current is therefore enhanced by the large cavity quality factor, I_H∝Re(σ_xy)E∝ Q_L. For a 2D electron density of 3×10^11cm^−2, filling factor ν=2, and Q_L∼10^5--10^6, we estimate a Hall current of order I_H∼10^−13--10^−12A for an axion mass m_a∼10^−5eV and a magnetic field ∼ 5× 10^4G. The current is more enhanced by increasing the size of 2D electrons keeping the strength of magnetic field. Under the assumed thermal-noise level and readout conditions, the estimated Hall-current signal can achieve a signal-to-noise ratio greater than unity for an observation time of order 100s. The proposed method exploits the unique combination of a finite, quantized transverse response and a strongly suppressed longitudinal dissipation in the quantum Hall state, providing an alternative to conventional metallic-antenna detection in axion haloscopes.
ER -