Journal
PHYSICAL REVIEW D
Volume 101, Issue 3, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevD.101.036006
Keywords
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Funding
- INFN
- National Science Foundation [PHY-1607611]
- DOE [DE-SC0009988]
- Paul Dirac fund at the Institute for Advanced Study
- Alfred P. Sloan Research Fellowship
- Department of Energy (DOE) Grant [DE-SC0019195]
- Australian Research Council
- JSPS KAKENHI Grants [JP18K13533, JP19H05810]
- World Premier International Research Center Initiative (WPI), MEXT, Japan
- U.S. Department of Energy (DOE) [DE-SC0019195] Funding Source: U.S. Department of Energy (DOE)
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For direct detection of sub-MeV dark matter, a promising strategy is to search for individual phonon excitations in a crystal. We perform an analytic calculation of the rate for light dark matter (keV < m(DM) < MeV) to produce two acoustic phonons through scattering in cubic crystals such as GaAs, Ge, Si, and diamond. The multiphonon rate is always smaller than the rate to produce a single optical phonon, whenever the latter is kinematically accessible. In Si and diamond, there is a dark matter mass range for which multiphonon production can be the most promising process, depending on the experimental threshold.
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