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The ultralight dark matter (ULDM) such as axion or wavelike scalar plays as aplausible DM candidate. Recently, the possible non-standard ULDM couplings drawmuch attention. In this work we investigate the detection of electromagneticcouplings in a few benchmark models of ULDM. For illustration, we consider thegeneric axion electrodynamics including CP violating coupling as well as thenewly proposed axion electromagnetodynamics. The superconducting radiofrequency (SRF) cavity with two-mode has more advantages than the traditionalcavity approach with static background field. We utilize the two-mode SRFcavity to probe the generic couplings of ULDM with frequency lower than GHz.The choices of the transverse electromagnetic modes are explicitly specifiedfor the detection. We show the sensitivity of the SRF cavity to the axioncouplings in the above frameworks.

Sensitivity of two-mode SRF cavity to generic electromagnetic interactions of ultralight dark matter