基于石墨烯的静电界面工程用于抗辐射MR-DWELL剂量计：一种设计框架
Graphene-Assisted Electrostatic Screening of Resonant Transport in MR-DWELL Dosimeters with Tunable Sensitivity--Radiation Tolerance Trade-off: A Reduced-Order Benchmark and Self-Consistent Perspective
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中文总结 AI 辅助
本研究提出一种石墨烯辅助的MR-DWELL剂量计，通过静电界面工程抑制辐射诱导的共振偏移，可在1 MGy剂量下保持良好性能，为抗辐射共振隧穿传感器设计提供定量基础。
中文摘要 AI 辅助
我们提出了一种由静电界面工程调控的石墨烯辅助MR-DWELL剂量计。通过调节h-BN间隔层，石墨烯量子电容与几何电容的比值可调控屏蔽因子，使辐射诱导的共振偏移抑制至原来的1/3，在高达1 MGy的辐射剂量下仍能保持共振传输，峰值电流保留率约83%，峰谷比（PVR）约为10。本征RC响应为亚皮秒级，二阶导数光谱可作为实用读出方式。三群体陷阱电荷框架解析了稳态与瞬态响应，表明尽管在500 Gy时出现稳态饱和，仍可实现FLASH剂量率区分。该模型为设计下一代抗辐射共振隧穿传感器提供了严谨的定量基础。
英文摘要
We propose a Multi-Resonant Double-barrier Quantum-dot-in-a-Well (MR-DWELL) dosimeter with a tunable trade-off between sensitivity and radiation tolerance, realized through graphene-assisted electrostatic screening. The sensing mechanism relies on radiation-induced trapped charge that shifts and broadens resonant tunneling states in the DWELL heterostructure. The~dimensionless capacitance ratio $η=C_Q/C_{\mathrm{geo}}$ is introduced as the universal design parameter: it~controls the screening factor $S=η/(1+η)$ and thereby the trade-off between sensitivity and radiation hardness. For $η=2.09$ the effective low-dose shift coefficient is reduced threefold (from $0.14$~to $0.045~\mathrm{meV/mGy}$), while the screened architecture retains $\sim\!83\%$ of the peak tunneling current and a peak-to-valley ratio $\sim\!10$ after $1~\mathrm{MGy}$, thereby preserving the dosimetric sensitivity required for practical readout. The~second-derivative spectroscopy $d^2I/dV^2$ is identified as a robust experimental readout. A~reduced-order Landauer model calibrated against literature data is employed for the screening physics, while a self-consistent NEGF-Poisson-trap framework is formulated for future quantitative validation. Explicit design rules for three operating regimes (high sensitivity, balanced, maximum hardness) are provided, together with a three-population trap model that conceptually enables dose-rate discrimination in the FLASH radiotherapy regime. A~comparative analysis of model vintages and their methodological foundations is included to guide interpretation of numerical predictions.
发表机构
- Tashkent Branch of National Research Nuclear University MEPhI（国立核研究大学MEPhI塔什干分校）
- Samara State Technical University（萨马拉国立技术大学）
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