Speaker
Description
The EDELWEISS direct detection experiment uses cryogenic Ge semiconductor detectors equipped with NTD thermal sensors to search for sub-GeV dark matter particles. In this presentation, I give an overview of our most recent results from searches for SIMPs and electron-scattering dark matter, using massive ~30 g Ge detectors operated both at the surface and at the LSM underground laboratory, respectively. The emphasis is given to the latter search where a charge resolution of ∼0.5 electron-hole pair (RMS) is achieved through Luke-Neganov amplification of the phonon signal at 78 V. We exploit the resulting sensitivity to energy deposits as low as the band gap energy (0.67 eV) to derive experimental constraints on dark matter particles interacting with electrons down to a 0.5 MeV/c² mass. These results are competitive with other state-of-the-art approaches and improve upon existing constraints from phonon-mediated cryogenic detectors.
