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The EDELWEISS collaboration reports on the search for Dark Matter (DM)particle interactions via Migdal effect with masses between $32$MeV$\cdot$c$^{-2}$ to $2$ GeV$\cdot$c$^{-2}$ using a $200$ g cryogenic Gedetector sensitive to simultaneously heat and ionization signals and operatedunderground at the Laboratoire Souterrain de Modane in France. The phononsignal was read out using a Transition Edge Sensor made of a NbSi thin film.The detector was biased at $66$ V in order to benefit from theNeganov-Trofimov-Luke amplification and resulting in a resolution on the energyof electron recoils of $4.46$ eV$_{ee}$ (RMS) and an analysis threshold of $30$eV$_{ee}$. The sensitivity is limited by a dominant background not associatedto charge creation in the detector. The search constrains a new region ofparameter space for cross-sections down to $10^{-29}$ cm$^2$ and masses between$32$ and $100$ MeV$\cdot$c$^{-2}$. The achieved low threshold with the NbSisensor shows the relevance of its use for athermal-phonon sensitive devices forlow-mass DM searches.

Search for sub-GeV Dark Matter via Migdal effect with an EDELWEISS germanium detector with NbSi TES sensors