Constraining Ultralight Dark Matter through an Accelerated Resonant Search

• URL: http://arxiv.org/abs/2309.16600v2
• Date: Thu, 11 Jul 2024 10:36:08 GMT
• Title: Constraining Ultralight Dark Matter through an Accelerated Resonant Search
• Authors: Zitong Xu, Xiaolin Ma, Kai Wei, Yuxuan He, Xing Heng, Xiaofei Huang, Tengyu Ai, Jian Liao, Wei Ji, Jia Liu, Xiao-Ping Wang, Dmitry Budker,
• Abstract summary: We investigate the nucleon couplings of ultralight axion dark matter using a magnetometer operating in a nuclear magnetic resonance mode. We achieve an ultrahigh sensitivity of 0.73 fT/Hz$1/2$ at around 5 Hz, corresponding to energy resolution of approximately 1.5$times 10-23,rmeV/Hz1/2$.
• Score: 14.200713169114342
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Experiments aimed at detecting ultralight dark matter typically rely on resonant effects, which are sensitive to the dark matter mass that matches the resonance frequency. In this study, we investigate the nucleon couplings of ultralight axion dark matter using a magnetometer operating in a nuclear magnetic resonance (NMR) mode. Our approach involves the use of a $^{21}$Ne spin-based sensor, which features the lowest nuclear magnetic moment among noble-gas spins. This configuration allows us to achieve an ultrahigh sensitivity of 0.73 fT/Hz$^{1/2}$ at around 5 Hz, corresponding to energy resolution of approximately 1.5$\times 10^{-23}\,\rm{eV/Hz^{1/2}}$. Our analysis reveals that under certain conditions it is beneficial to scan the frequency with steps significantly larger than the resonance width. The analytical results are in agreement with experimental data and the scan strategy is potentially applicable to other resonant searches. Further, our study establishes stringent constraints on axion-like particles (ALP) in the 4.5--15.5 Hz Compton-frequency range coupling to neutrons and protons, improving on prior work by several-fold. Within a band around 4.6--6.6 Hz and around 7.5 Hz, our laboratory findings surpass astrophysical limits derived from neutron-star cooling. Hence, we demonstrate an accelerated resonance search for ultralight dark matter, achieving an approximately 30-fold increase in scanning step while maintaining competitive sensitivity.

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