Optimal Calibration-Free Observable for the Nucleon-Coupling Ratio in a Dual-Alkali Comagnetometer for Dark Matter Searches

Yossi Rosenzweig, Yevgeny Kats, Eli Sarid +3

A dual-alkali single-cell ${}^{87}$Rb-${}^{39}$K-${}^3$He comagnetometer can read an axionlike dark matter signal through two optical-rotation channels, encoding the ratio $\mathcal{R}…