Kavli Affiliate: Jia Liu
| First 5 Authors: Kai Wei, Zitong Xu, Yuxuan He, Xiaolin Ma, Xing Heng
| Summary:
Observational evidence suggests the existence of dark matter (DM), which
comprises approximately $84.4%$ of matter in the universe. Recent advances in
tabletop quantum sensor technology have enabled searches for nongravitational
interactions of DM. Our experiment named ChangE utilizes Coupled Hot Atom
eNsembles to search for liGht dark mattEr and new physics. We identify a
strongly-coupled hybrid spin-resonance (HSR) regime that enhances the bandwidth
of $^{21}$Ne nuclear spin by three orders of magnitude while maintaining high
sensitivity. In combination with a self-compensating mode (SC) for low
frequencies, we present a comprehensive broadband search for axion-like dark
matter with Compton frequencies in the range of $[0.01, 1000]$ Hz. We set new
constraints on the DM interactions with neutrons and protons, accounting for
the stochastic effect. For the axion-neutron coupling, our results reach a low
value of $|g_{ann}|le 3times 10^{-10}$ in the frequency range $[0.02 , 4]$ Hz
surpassing astrophysical limits and provide the strongest laboratory
constraints in the $[10, 100]$ Hz range. For the axion-proton coupling, we
offer the best terrestrial constraints for the frequency below 100 Hz.
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