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Abstract:
Exploring the Sub-GeV frontier for Light Dark Matter (LDM), resolving the Cosmic Neutrino Background (CνB), and observing Coherent Elastic Neutrino-Nucleus Scattering (CEνNS) require detectors with strictly sub-meV energy thresholds and massive multiplexing capabilities. Historically, achieving sub-meV thresholds alongside nanosecond timing and scalability has represented an “impossible triangle” for cryogenic sensors. In this presentation, the speaker will introduce the SuperEM (Superconductor-Coupled Semiconductor Electron-Multiplying) detector architecture, a novel S-I-P-N framework designed to overcome these limitations. By integrating a superconducting absorber (S-Layer), a quantum tunneling barrier (I-Layer), and a charge multiplication region (P-N Junction), the SuperEM scheme achieves a sub-meV threshold, high gain, and a nanosecond-level non-thermal equilibrium response while maintaining compatibility with scalable semiconductor processes.
About the speaker:
Dr. Xilei Sun is a researcher at the Institute of High Energy Physics (IHEP). His research focuses on advanced radiation detection technologies, space astronomy instrumentation, and low-background neutrino and dark matter experiments. Dr. Sun served as co-proposer and prototype developer for the 5-sided sensitive 3D imaging calorimeter of HERD (scheduled for launch in 2029) and led the proposal and development of the SiPM+LaBr3 space gamma-ray detector on GECAM (launched in 2020). He also proposed and prototyped both a dual-scintillating crystal scheme for dark matter detection and a cryogenic CsI detector for coherent elastic neutrino-nucleus scattering (CEνNS). In engineering leadership, Dr. Sun served as task leader for the 20,000-ton ultrapure liquid scintillator mixing for the JUNO experiment (completed August 2025). He also led a key R&D project on ultra-high energy resolution and multi-modal radiation detectors (completed October 2025), which earned the Special Prize of the Chinese Society of Radiation Protection Science and Technology Award. Currently, Dr. Sun is pioneering the SuperEM scheme—a sub-meV, ultra-low threshold superconductor-coupled semiconductor detector targeting next-generation neutrino and dark matter searches.
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Meeting ID 会议号: 93135039453
Meeting URL 会议链接:: https://zoom.us/j/93135039453?pwd=L6nHYMbZmpzysMaacR2kZwB53yDJcD.1
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