14 papers
Development and characterization of a wingless ICPC HPGe detector with thin amorphous-Ge contacts
S. A. Panamaldeniya, K. M. Dong, D. M. Mei
High-purity germanium (HPGe) detectors with thin amorphous-germanium (a-Ge) contacts can provide bipolar charge blocking and surface passivation while minimizing contact-related in…
Detector-Grade Germanium as a Low-Disorder Host for Indium-Acceptor Spin Qubits: A Five-Qubit Materials-to-Architecture Design Study
D. -M. Mei, K. -M. Dong, S. A. Panamaldeniya +4
Acceptor-bound hole spins in germanium (Ge) offer a promising but underexplored route to semiconductor quantum information processing. We present a theory-guided design study of a…
AIMBio-Mat: An AI-Native FAIR Platform for Closed-Loop Materials Discovery and Biomedical Translation
D. -M. Mei, K. Acharya, C. M. Adhikari +51
Materials discovery and biomedical translation increasingly require models that can reason across composition, processing, structure, biological response, manufacturability, safety…
Building a Regional Data-Centric Materials Science Ecosystem for Processing-Rich Materials Innovation in the Great Plains
D. -M. Mei, K. Acharya, C. M. Adhikari +52
Data-centric materials science is changing how materials are discovered, optimized, manufactured, and qualified, yet many deployment-limiting materials problems still depend on exp…
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)…
Two-Qubit Module Based on Phonon-Coupled Ge Hole-Spin Qubits: Design, Fabrication, and Readout at 1-4 K
D. -M. Mei, S. A. Panamaldeniya, K. -M. Dong +2
We present a device-level design study for a two-qubit module based on phonon-coupled germanium (Ge) hole-spin qubits targeted for operation at --. Building on pri…
Evaluating the Effective Segregation Coefficient in High-Purity Germanium (HPGe) Crystals for Ge Detector Development in Rare-Event Searches
S. Chhetri, D. -M. Mei, S. Bhattarai +5
The performance and scalability of rare-event physics experiments depend on large-volume, detector-grade high-purity germanium (HPGe) crystals with precise control of impurity segr…
Probing low-mass dark matter from sub-MeV to sub-GeV with germanium-based quantum phononic spectroscopy
D. -M. Mei, N. Budhathoki, S. A. Panamaldeniya +5
We present a germanium phonon-to-charge transducer that integrates a slow-phonon phononic-crystal (PnC) region with radio-frequency quantum point-contact (RF-QPC) readout at 4 K, a…
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…
Ge-based Quantum Sensors for Low-Energy Physics
D. -M. Mei, N. Budhathoki, S. A. Panamaldeniya +5
We present \textbf{GeQuLEP} (Germanium-based Quantum Sensors for Low-Energy Physics), a conceptual design for an advanced quantum sensing platform integrating high-purity germanium…
Phonon-Coupled Hole-Spin Qubits in High-Purity Germanium: Design and Modeling of a Scalable Architecture
D. -M. Mei, S. A. Panamaldeniya, K. Dong +3
We present a design and modeling of a scalable quantum processor architecture utilizing hole-spin qubits defined in gate-controlled germanium (Ge) quantum dots, where coherent spin…