7 papers · 1 filter
Fabrication and characterization of lithium-diffused inverted coaxial point-contact HPGe detectors
Anupama Karki, Kunming Dong, Dongming Mei
High-purity germanium (HPGe) detectors with low capacitance, low electronic noise, and stable high-voltage operation are important for high-resolution gamma-ray spectroscopy and ra…
Post-diffusion cooling effects on Hall-derived active lithium donor profiles in high-purity germanium
Kunming Dong, Dongming Mei, Anupama Karki +2
Lithium (Li) diffusion is commonly used to form contacts in high-purity germanium (HPGe) detectors, but the final electrically active donor profile can be sensitive to the…
Comparative assessment of germanium-based spin-qubit modalities: donor, acceptor, gate-defined hole, and gate-defined electron platforms
D. -M. Mei, K. -M. Dong, S. A. Panamaldeniya +4
High-purity germanium (Ge) has re-emerged as a versatile semiconductor platform for spin-based quantum information processing because it combines mature materials processing, acces…
Process Development and First Cryogenic Operation of Compact Germanium Ring-Contact HPGe Prototypes
Kunming Dong, Shasika Panamaldeniya, Dongming Mei
Rare-event experiments such as LEGEND-1000 require high-purity germanium (HPGe) detectors with excellent energy resolution, low electronic noise, and scalable low-background packag…
Internal Charge Amplification in Germanium at 77K and 4K: From Single-Free-Flight Bounds to a Physics-Informed Ionization Model
Dongming Mei, Kunming Dong, Narayan Budhathoki +2
Internal charge amplification (ICA) in cryogenic high-purity germanium (HPGe) can lower detection thresholds by providing gain inside the detector crystal, but reliable operation r…
Fabrication and Characterization of p-type Inverted Coaxial Point Contact (ICPC) Detectors with a-Ge Dual-Blocking Contacts
S. A. Panamaldeniya, K. M. Dong, D. M. Mei
We report the fabrication and characterization of two p-type inverted coaxial point contact (ICPC) high-purity germanium (HPGe) detectors, SAP16 and SAP17, produced from USD-grown…
Hybrid-Contact Planar HPGe Process Vehicle Toward Ring-Contact Designs
Kunming Dong, Dongming Mei, Shasika Panamaldeniya +3
Rare-event searches including dark matter, coherent elastic neutrino--nucleus scattering (CENS), and neutrinoless double-beta decay (0) require high-purity germanium (HPGe)…