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The comagnetometer has been one of the most sensitive devices with which totest new physics related to spin-dependent interactions, but thecomagnetometers based on overlapping ensembles of multiple spin species usuallysuffer from systematic errors due to magnetic field gradients. Here, we proposea comagnetometer based on the Zeeman transitions of the dual hyperfine levelsin ground-state 87Rb atoms, which shows nearly negligible sensitivity tovariations of laser power and frequency, magnetic field, and magnetic fieldgradients. We measured the hypothetical spin-dependent gravitational energy ofthe proton with the comagnetometer, which is smaller than 4*10^{-18} eV,comparable to the most stringent existing constraint. Through optimization ofthe atomic cell, it is possible to improve the accuracy of the comagnetometerfurther.

A Single-species Atomic Comagnetometer Based on 87Rb atoms