Kavli Affiliate: Jia Liu
| First 5 Authors: Kai Wei, Zitong Xu, Yuxuan He, Xiaolin Ma, Xing Heng
| Summary:
Recent advances in tabletop quantum sensor technology have enabled searches
for nongravitational interactions of dark matter (DM). Traditional axion DM
experiments rely on sharp resonance, resulting in extensive scanning time to
cover a wide mass range. In this work, we present a broadband approach in an
alkali-${}^{21}$Ne spin system. We identify two distinct hybrid spin-coupled
regimes: a self-compensation (SC) regime at low frequencies and a hybrid spin
resonance (HSR) regime at higher frequencies. By utilizing these two distinct
regimes, we significantly enhance the bandwidth of ${}^{21}$Ne nuclear spin
compared to conventional nuclear magnetic resonance, while maintaining
competitive sensitivity. We present a comprehensive broadband search for
axion-like dark matter, covering 5 orders of magnitude of Compton frequencies
range within $[10^{-2}, , 10^3]$ Hz. We set new constraints on the axion dark
matter interactions with neutrons and protons, accounting for the effects of DM
stochasticity. For the axion-neutron coupling, our results reach a low value of
$|g_{ann}|le 3times 10^{-10}$ in the frequency range $[2times 10^{-2}, ,
4]$ Hz surpassing astrophysical limits and providing the strongest laboratory
constraints in the $[10, , 100]$ Hz range. For the axion-proton coupling, we
offer the best terrestrial constraints for the frequency ranges $[2times
10^{-2}, , 5]$Hz and $[16, , 7times 10^{2}]$ Hz.
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