12 papers
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…
Preparing Students for AI-Powered Materials Discovery: A Workflow-Aligned Framework for AI Literacy, Equity, and Scientific Judgment
Dongming Mei, Katherine Moore, Ben Sayler
Artificial intelligence (AI) is reshaping education, scientific training, and materials discovery. In materials science, AI models increasingly support property prediction, experim…
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…
Machine-Learning Optimization of Detector-Grade Yield in High-Purity Germanium Crystal Growth
Athul Prem, Dongming Mei, Sanjay Bhattarai +2
High-purity germanium (HPGe) crystals underpin some of the most sensitive detectors used in fundamental physics and other high-resolution radiation-sensing applications. Despite th…
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)…
Depletion-limited Effective Hall mobility in Micrometer-Scale High-Purity Germanium Crystals
Narayan Budhathoki, Dongming Mei, Sanjay Bhattarai +5
Electrostatic effects can strongly constrain charge transport in thinned high-purity germanium (HPGe), with direct implications for radiation detectors and Ge-based electronic and…
Virtual Majorana Neutrinos and the Minimum Neutrino Mass Scale in Neutrinoless Double-Beta Decay
Dongming Mei, Kunming Dong, Austin Warren +1
Virtual Majorana neutrinos are indispensable for neutrinoless double-beta (0) decay. In this study, we demonstrate that the overlap of the virtual Majorana neutrino wavefuncti…
Impact of recent updates to neutrino oscillation parameters on the effective Majorana neutrino mass in 0 Decay
Dongming Mei, Kunming Dong, Austin Warren +1
We investigate how recent updates to neutrino oscillation parameters and the sum of neutrino masses influence the sensitivity of neutrinoless double-beta (0) decay experiments…