  Searching for exotic spin-dependent interactions that beyond the standard
model has been of interest for past decades and is crucial for unraveling the
mysteries of the universe. Previous laboratory searches primarily focus on
searching for either static or modulated energy-level shifts caused by exotic
spin-dependent interactions. Here, we introduce a theoretical model based on
thermal motion of particles, providing another efficient way to search for
exotic spin-dependent interactions. The theoretical model indicates that as the
exotic spin-dependent interactions are related with the relative displacements
and velocities of atoms, atoms undergoing thermal motion would experience a
fluctuating energy-level shift induced by the exotic interactions. Moreover,
the resulting exotic energy-level shift noise could be sensed by
high-sensitivity instruments. By using the model and taking the
high-sensitivity atomic magnetometer as an example, we set the most stringent
laboratory experiment constraints on eight different kinds of exotic spin- and
velocity-dependent interactions, with five of which at the force range below 1
cm have not been covered previously. Furthermore, this theoretical model can be
easily applied in other fields of quantum sensing, such as atomic clocks, atom
interferometers and NV-diamond sensors, to further improve the laboratory
constraints on exotic spin-dependent interactions.
