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Collective excitations in condensed matter systems, such as phonons andmagnons, have recently been proposed as novel detection channels for light darkmatter. We show that excitation of i) optical phonon polaritons in polarmaterials in an ${\mathcal O}$(1 T) magnetic field (via the axion-photoncoupling), and ii) gapped magnons in magnetically ordered materials (via theaxion wind coupling to the electron spin), can cover the difficult-to-reach${\mathcal O}$(1-100) meV mass window of QCD axion dark matter with less than akilogram-year exposure. Finding materials with a large number of optical phononor magnon modes that can couple to the axion field is crucial, suggesting aprogram to search for a range of materials with different resonant energies andexcitation selection rules; we outline the rules and discuss a few candidatetargets, leaving a more exhaustive search for future work. Ongoing developmentof single photon, phonon and magnon detectors will provide the key forexperimentally realizing the ideas presented here.

Detectability of Axion Dark Matter with Phonon Polaritons and Magnons