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We investigated charge transport in an n-type germanium detector at 5.2 K toexplore new technology for enhancing low-mass dark matter detectionsensitivity. Calculations of dipole and cluster dipole state binding energiesand electric field-dependent trapping cross-sections are critical to developinglow-threshold detectors. The detector operates in two modes: depleting at 77Kbefore cooling, or directly cooling to 5.2 K and applying different biasvoltages. Results indicated lower binding energy of charge states in the secondmode, at zero field and under an electric field, suggesting different chargestates formed under different operating modes. Measured cluster dipole anddipole state binding energies at zero field were 7.884$\pm$0.644 meV and8.369$\pm$0.748 meV, respectively, signifying high low-threshold potential forlow-mass dark matter searches in the future.

Development of Low-Threshold Detectors for Low-Mass Dark Matter Searches Using an N-Type Germanium Detector at 5.2 K