First germanium-based constraints on sub-MeV Dark Matter with the
  EDELWEISS experiment
  The EDELWEISS collaboration has performed a search for Dark Matter (DM)
particles interacting with electrons using a 33.4 g Ge cryogenic detector
operated underground at the LSM. A charge resolution of 0.53 electron-hole
pairs (RMS) has been achieved using the Neganov-Trofimov-Luke amplification
with a bias of 78 V. We set the first Ge-based constraints on sub-MeV/c$^{2}$
DM particles interacting with electrons, as well as on dark photons down to 1
eV/c$^2$. These are competitive with other searches. In particular, new limits
are set on the kinetic mixing of dark photon DM in a so far unconstrained
parameter space region in the 6 to 9 eV/c$^2$ mass range. These results
demonstrate the high relevance of cryogenic Ge detectors for the search of DM
interactions producing eV-scale electron signals.
