BEGIN:VCALENDAR VERSION:2.0 PRODID:researchseminars.org CALSCALE:GREGORIAN X-WR-CALNAME:researchseminars.org BEGIN:VEVENT SUMMARY:Peizhi Du (Stony Brook University) DTSTART:20220315T183000Z DTEND:20220315T193000Z DTSTAMP:20260423T024538Z UID:nhetc/42 DESCRIPTION:Title: N ew backgrounds and new ideas for sub-GeV dark matter direct detection\ nby Peizhi Du (Stony Brook University) as part of NHETC Seminar\n\n\nAbstr act\nProbing sub-GeV dark matter requires designing low threshold detector s and understanding backgrounds. In this talk I will address these two iss ues. First\, we point out several unexplored low-energy backgrounds in sub -GeV dark matter searches\, which arise from high-energy particles of cosm ic or radioactive origin that interact with detector materials. In this ta lk\, I will focus on Cherenkov radiation and luminescence from electron-ho le pair recombination. We demonstrate that these processes provide plausib le explanations of the observed events at SENSEI and SuperCDMS HVeV. Secon d\, we propose a new idea of probing light dark matter using doped semicon ductors. Dopants in semiconductors form energy levels that are tens of meV below the conduction band or above the valence band. These materials can be new detector targets for dark matter scattering with a threshold of ten s of meV\, which can probe dark matter masses down to tens of keV.\n LOCATION:https://researchseminars.org/talk/nhetc/42/ END:VEVENT END:VCALENDAR