Extended Data Fig. 8: Kerr effect scheme of dark matter axion detection using DAQ.
a, The Kerr effect scheme: a dark matter axion resonantly excite an axion polariton inside the DAQ material under an external B∥ field (B∥ = 5 T). The axion polariton is essentially a coherent oscillation of θ(ω), where \(\omega =\sqrt{{m}_{{\rm{DAQ}}}^{2}+{b}^{2}}\). By applying an out-of-plane electric field Ez, such a coherent oscillation of θ(ω) will lead to an oscillating magnetization Mz(ω) = θ(ω)Ez. We propose to use MOKE with to measure this oscillating magnetization. b, Dark matter detection sensitivity (gaγ) as a function of the axion mass using the Kerr scheme (see details in Methods.6).
