Design and characterization of a phonon-mediated cryogenic particle detector with an eV-scale threshold and 100 keV-scale dynamic range

We present the design and characterization of a cryogenic phonon-sensitive 1-gram Si detector exploiting Neganov-Trofimov-Luke effect to detect single-charge excitations. This device achieved 2.65(2)~eV phonon energy resolution when operated without voltage bias across crystal corresponding charge 0.03 electron-hole pairs at 100~V bias. With continuous-readout data acquisition system an offline optimum-filter trigger, we obtain 9.2~eV threshold with trigger rate order 20~Hz. The detector's scale is calibrated up 120~keV using estimator based on pulse area. high performance this allows its application different fields where excellent resolution, low threshold, large dynamic range are required, including dark matter searches, precision measurements coherent neutrino-nucleus scattering, ionization yield measurements.