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The low-mass dark matter (DM) such as axion or wavelike scalar is a plausibleDM candidate. Recently, the possible non-standard couplings of low-mass DM hasdrawn much attention. In this work we investigate the detection ofelectromagnetic couplings in a few benchmark models of low-mass DM. Forillustration, we consider the generic axion electrodynamics including CPviolating coupling as well as the newly proposed axion electromagnetodynamics.The superconducting radio frequency (SRF) cavity with two modes has moreadvantages than the traditional cavity approach with static background field.We utilize the two-mode SRF cavity to probe the generic couplings of low-massDM with frequency lower than GHz. We show the sensitivity of the SRF cavity tothe axion couplings in the above frameworks.

Sensitivity of two-mode SRF cavity to generic electromagnetism of sub-$\mu$eV dark matter