  The CSC (cryogenic scintillating calorimeter) technology devoted to rare
event searches is reaching the sensitivity level required for the hunt of dark
matter-electron scatterings. Dark matter-electron interactions in scintillating
targets are expected to stimulate the emission of single photons, each of
energy equal to the target electronic band gap. The electronic band gap in
scintillators like NaI/GaAs is of O(eV). The search for this signal can be done
by an array of cryogenic light detectors with eV/sub-eV energy resolution. In
this work, we describe the detection principle, the detector response and the
envisioned detector design to search for dark matter interacting with electrons
via the measurement of the scintillation light at millikelvin. First
sensitivity projections are provided, which show the potential of this
research.
