Journal
PHYSICAL REVIEW D
Volume 98, Issue 11, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevD.98.115034
Keywords
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Funding
- DoE [DE-AC02-05CH11231]
- National Science Foundation (NSF) [PHY-1316783, PHY-1002399]
- National Science Foundation [PHY-1607611, NSF PHY-1748958]
- Office of Science of the DoE [DE-AC02-05CH11231]
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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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