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Exotic spin-dependent interactions between fermions have recently attractedattention in relation to theories beyond the Standard Model. The exoticinteractions can be mediated by hypothetical fundamental bosons which mayexplain several unsolved mysteries in physics. Here we expand this area ofresearch by probing an exotic parity-odd spin- and velocity-dependentinteraction between the axial-vector electron coupling and the vector nucleoncoupling for polarized electrons. This experiment utilizes a high-sensitivityatomic magnetometer, based on an optically polarized vapor that is a source ofpolarized electrons, and a solid-state mass containing unpolarized nucleons.The atomic magnetometer can detect an effective magnetic field induced by theexotic interaction between unpolarized nucleons and polarized electrons. We setan experimental limit on the electron-nucleon coupling $g_\text{A}^\text{e}g_\text{V}^\text{N}<$ $10^{-30}$ at the mediator boson mass below $10^{-4}$ eV,significantly improving the current limit by up to 17 orders of magnitude.

Experimental limit on an exotic parity-odd spin- and velocity-dependent interaction using an optically polarized vapor