Graphene-Assisted Electrostatic Screening of Resonant Transport in Radiation-Tolerant MR-DWELL Dosimeters

Abstract

We propose a graphene-assisted MR-DWELL dosimeter for radiation-tolerant sensing, utilizing a dimensionless capacitance ratio to control electrostatic screening and resonant transport. By tuning the h-BN spacer thickness, the screening factor balances radiation hardness and response speed. The analytical model predicts a threefold reduction in the resonance shift and 83% peak current retention at 1 MGy, with a peak-to-valley ratio of 10. Second-derivative spectroscopy d^2I/dV^2 is identified as a robust experimental readout. A self-consistent NEGF-Poisson framework and a three-population trapped-charge model are formulated to resolve the trade-off between steady-state saturation at 500 Gy and transient FLASH dose-rate discrimination. Explicit design rules for high sensitivity, balanced, and maximum hardness regimes are provided, establishing electrostatic interface engineering as a physically motivated foundation for next-generation resonant-tunneling sensors.