Development of low-threshold detectors for low-mass dark matter searches with a p-type germanium detector operated at cryogenic temperature

Abstract

This study investigates new technology for enhancing the sensitivity of low-mass dark matter detection by analyzing charge transport in a p-type germanium detector at 5.2 K. To achieve low-threshold detectors, precise calculations of the binding energies of dipole and cluster dipole states, as well as the cross-sections of trapping affected by the electric field, are essential. The detector was operated in two modes: depleted at 77 K before cooling to 5.2 K and cooled directly to 5.2 K with various bias voltages. Our results indicate that the second mode produces lower binding energies and suggests different charge states under varying operating modes. Notably, our measurements of the dipole and cluster dipole state binding energies at zero fields were $8.716\pm 0.435$ meV and $6.138\pm 0.308$ meV, respectively. These findings have strong implications for the development of low-threshold detectors for detecting low-mass dark matter in the future.

arXiv comment7 pages, 8 figures. arXiv admin note: substantial text overlap with arXiv:2302.08414

References in corpus (12)

• Direct Detection of Sub-GeV Dark Matter
• Search for Low-Mass WIMPs with SuperCDMS
• Results from a Low-Energy Analysis of the CDMS II Germanium Data
• Search for Low-Mass Dark Matter with CDMSlite Using a Profile Likelihood Fit
• Searches for electron interactions induced by new physics in the EDELWEISS-III germanium bolometers
• Fabrication and Characterization of High-Purity Germanium Detectors with Amorphous Germanium Contacts
• Direct Detection of MeV-Scale Dark Matter Utilizing Germanium Internal Amplification for the Charge Created by the Ionization of Impurities
• Impact of Charge Trapping on the Energy Resolution of Ge Detectors for Rare-Event Physics Searches
• Characterization of High-Purity Germanium (Ge) Crystals for Developing Novel Ge Detectors
• $\alpha$-event Characterization and Rejection in Point-Contact HPGe Detectors
• Evidence of cluster dipole states in germanium detectors operating at temperatures below 10 K
• Average Energy Expended Per e-h Pair and Energy Scale Function for Germanium-Based Dark Matter Experiments