2025/08/02 by Aiichi Iwazaki, Iwazaki, Aiichi
Materials Science · Physics and Astronomy · #Chemical and Physical Properties of Materials #Dark Matter and Cosmic Phenomena #FOS: Physical sciences #High Energy Physics - Phenomenology (hep-ph) #Topological Materials and Phenomena
paper · pdf · doi:10.48550/arxiv.2508.01123
openalex publication_date 2025/08/02 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
We propose a new method for detecting dark matter axions using a resonant cavity coupled with a quantum Hall system. When a small sample exhibiting quantum Hall effect is placed inside the cavity and the cavity is tuned to resonance, two-dimensional electrons absorb the amplified radiation, leading to a rise in the sample's temperature. By monitoring this temperature increase, the mass ma of the axion can be inferred. As an example, consider a GaAs sample with surface area S=0.01cm2 and small thickness d = 1 μm and its heat capacity Cs at temperature T = 20 mK. Because the energy flux of the incoming radiation is Pra∼ 5.9×10-20W (S/0.01cm2) (gaγγ/10-14GeV-1)2 (σ/107eV) (10-5eV/ma)3(B/15T)2 (ρd/0.3\rm GeV cm-3) at the resonance with electrical conductivity σ of the cavity wall, the temperature increase is Pratob/Cs ≃ 4.8mK(tob/1s)(gaγγ/10-14GeV-1)2(20mK/T)3 (10-5eV/ma)3(σ/107eV)(1μm/d) (B/15T)2 with 1T=104 Gauss where tob=1s is the observation time. It must be smaller than a time constant τ>1s associated with the heat dissipation into thermal bath. Such a large time constant can be realized using superconducting nanowire lead and thin film pedestal supporting the sample dilution refrigerator. The temperature increase ΔT∼ 5mK is detectable using quantum point contact thermometer.