Detectable electric current induced by the dark matter axion in a conductor

Abstract We propose a method of detecting the dark matter axion by using two slabs conductor. The flat surfaces are set face to face, parallel each other. An external magnetic field B is applied. Radiation converted from arises between slabs. When we tune spacing l such that = π/ma with mass ma, resonance occurs so radiation becomes strong. Furthermore, electric current flowing on surface enhanced. show large enough be detectable at resonance. It reaches 0.7 × 10−9 A $(10^{-5}\, \mbox{eV}/m_a)^{1/2} \, (B/5\, \mbox{T}) (L/10\, \mbox{cm}) (\sigma /3.3\times 10^7 \rm eV)$ 6N copper for square side length L and high electrical conductivity σ temperature T ∼ 1 K. power Joule heating $0.3\times 10^{-22} \mbox{W} (B/5 \mbox{T})^2 (10^{-5} (L/10 \mbox{cm})^2 eV)$. amplify an LC circuit factor QLC, signal-to-noise ratio $4.5\times 10^{4} (Q_\mathrm{LC}/10^6) (t_\mathrm{obs}/1\, \mathrm{s})^{1/2}\, \mbox{eV}/m_a) observation time tobs.