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We conducted a search for an exotic spin- and velocity-dependent interactionfor polarized electrons with an experimental approach based on ahigh-sensitivity spin-exchange relaxation-free (SERF) magnetometer, whichserves as both a source of polarized electrons and a magnetic-field sensor. Theexperiment aims to sensitively detect magnetic-fieldlike effects from theexotic interaction between the polarized electrons in a SERF vapor cell andunpolarized nucleons of a closely located solid-state mass. We reportexperimental results on the interaction with 82 h of data averaging, which setsan experimental limit on the coupling strength around $10^{-19}$ for the axionmass $m_a \lesssim 10^{-3}$ eV, within the important axion window.

physical review letters

Experimental Constraint on an Exotic Spin- and Velocity-Dependent  Interaction in the Sub-meV Range of Axion Mass with a Spin-Exchange  Relaxation-Free Magnetometer