Probing low-mass dark matter from sub-MeV to sub-GeV with germanium-based quantum phononic spectroscopy

D. -M. Mei, N. Budhathoki, S. A. Panamaldeniya +5

We present a germanium phonon-to-charge transducer that integrates a slow-phonon phononic-crystal (PnC) region with radio-frequency quantum point-contact (RF-QPC) readout at 4 K, a…