A dc SQUID operated at the flux sweet spot with lock-in modulation yields an ultra-broadband axion search with projected sensitivity |g_aγγ| ≳ 10^{-16} GeV^{-1} across 15 orders of magnitude in mass.
Laboratory Constraints on the Neutron-Spin Coupling of feV-Scale Axions
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A ferromagnetic levitated magnetometer with double-resonance mode reaches 0.7 fT magnetic resolution at 276 Hz and sets new direct limits on axionlike dark matter photon coupling g_aγ ~10^{-7} GeV^{-1} in the 40-3000 Hz band, improving prior limits by more than four orders of magnitude.
Periodic modulation in a hybrid atomic system induces Floquet renormalization of the Fermi-contact spin-exchange coupling governed by a zeroth-order Bessel function, enabling continuous tuning and suppression of the interaction.
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Floquet engineering of spin-spin interactions in a hybrid atomic system
Periodic modulation in a hybrid atomic system induces Floquet renormalization of the Fermi-contact spin-exchange coupling governed by a zeroth-order Bessel function, enabling continuous tuning and suppression of the interaction.