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Directional detection of dark matter with anisotropic response functions
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Direct detection for sub-GeV dark matter is developing rapidly, with many novel experimental ideas and theoretical methods emerging. In this work, we extend the dielectric formalism for dark matter scattering to incorporate anisotropic material responses, enabling directionally-sensitive experiments with a broad class of target materials. Using a simple model of an anisotropic electron gas, we demonstrate the importance of many-body effects such as the plasmon, and show that even when the dark matter kinetic energies are much smaller than the plasmon energy, the tail of an anisotropic plasmon can still produce a sizeable daily modulation. We highlight the relevant experimental techniques required to establish the target response, as well as the challenges in extracting a response function which is truly free of modeling uncertainties.
Forward citations
Cited by 5 Pith papers
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Ubiquitous Corotation of Dark Matter Halos: Implications for Direct Detection
Dark matter in simulated Milky Way analogues preferentially corotates with the baryonic disk, suppressing predicted direct-detection rates for light WIMPs, reducing directional modulation, and producing a 21% astrophy...
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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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SPLENDOR: a novel detector platform to search for light dark matter with narrow-gap semiconductors
A dark matter detector platform combining a 60 meV-gap semiconductor (Eu5In2Sb6) with cryogenic HEMT readout and daily modulation analysis is presented, with projected sensitivity to sub-MeV dark matter.
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Unconventional Materials for Light Dark Matter Detection
TiSe2, Sr2RuO4, and hole-doped diamond are projected to improve sub-MeV dark matter detection reaches by one to three orders of magnitude over existing proposals, with directional sensitivity from their anisotropic responses.
- First High-Throughput Evaluation of Dark Matter Detector Materials
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