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We report on a search for ultra-low-mass axion-like dark matter by analysingthe ratio of the spin-precession frequencies of stored ultracold neutrons and$^{199}$Hg atoms for an axion-induced oscillating electric dipole moment of theneutron and an axion-wind spin-precession effect. No signal consistent withdark matter is observed for the axion mass range $10^{-24}~\textrm{eV} \le m_a\le 10^{-17}~\textrm{eV}$. Our null result sets the first laboratoryconstraints on the coupling of axion dark matter to gluons, which improve onastrophysical limits by up to 3 orders of magnitude, and also improves onprevious laboratory constraints on the axion coupling to nucleons by up to afactor of 40. The results were initially presented in Phys. Rev. X 7, 041034,of which this proceeding is largely a summary.

Hunting for Axionlike Dark Matter by Searching for an Oscillating Neutron Electric Dipole Moment