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Optimal anti-ferromagnets for light dark matter detection
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We propose anti-ferromagnets as optimal targets to hunt for sub-MeV dark matter with spin-dependent interactions. These materials allow for multi-magnon emission even for very small momentum transfers, and are therefore sensitive to dark matter particles as light as the keV. We use an effective theory to compute the event rates in a simple way. Among the materials studied here, we identify nickel oxide (a well-assessed anti-ferromagnet) as an ideal candidate target. Indeed, the propagation speed of its gapless magnons is very close to the typical dark matter velocity, allowing the absorption of all its kinetic energy, even through the emission of just a single magnon.
Forward citations
Cited by 3 Pith papers
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Direct Detection of Leptophobic Dark Matter with Electronic Collective Excitations
Leptophobic dark matter can excite plasmons in silicon through hadronic loops, and SENSEI data now constrain its nucleon cross section down to ~1e-31 cm^2 in the sub-MeV mass range.
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Spin-dependent dark matter scattering in quasi-two-dimensional magnets
Spin-dependent dark matter scattering off magnons in quasi-2D (anti)ferromagnets can produce an order-10 percent daily modulation, offering directional sensitivity for keV to MeV mass dark matter.
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Hunting axion dark matter with anti-ferromagnets: a case study with nickel oxide
Axion dark matter with meV-scale masses could be absorbed by magnons in nickel oxide, producing both resonant and broadband detection channels.
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