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Directional detection of light dark matter with polar materials

  • Author(s): Griffin, S
  • Knapen, S
  • Lin, T
  • Zurek, KM
  • et al.

Published Web Location

https://arxiv.org/abs/1807.10291
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Abstract

We consider the direct detection of dark matter (DM) with polar materials, where single production of optical or acoustic phonons gives an excellent reach to the scattering of sub-MeV DM for both scalar and vector mediators. Using density functional theory, we calculate the material-specific matrix elements, focusing on GaAs and sapphire, and show that DM scattering in an anisotropic crystal such as sapphire features a strong directional dependence. For example, for a DM candidate with mass 40 keV and relic abundance set by freeze-in, the daily modulation in the interaction rate can be established at 90% C.L. with a gram year of exposure. Nonthermal dark photon DM in the meV-eV mass range can also be effectively absorbed in polar materials.

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