Multi-Field Modulation of Tunneling Current, Differential Resistance and Noise in n⁺–GaAs/AlGaAs Tunnel Diodes
Abstract
This work presents a theoretical study of differential resistance and noise in tunnel diodes under combined optical, magnetic, and high-frequency electromagnetic fields. The tunneling current is modeled using the Tsu–Esaki approach with WKB approximation, while magnetic field effects are introduced via Landau quantization. Optical excitation leads to quasi-Fermi-level splitting and enhances the tunneling current, thereby modulating and smoothing the negative differential resistance (NDR) region. High-frequency fields further modify the barrier transparency, thereby affecting the device's dynamic behavior. Noise analysis based on shot noise and Fano factor shows that a high signal-to-noise ratio (SNR) can be maintained under external perturbations. A generalized multi-field model for n⁺–GaAs/AlGaAs heterostructures is proposed, demonstrating controllable tunneling dynamics, low noise, and stable operation in the sub-THz range. The results indicate strong potential for applications in high-speed optoelectronics and radiation-resistant space electronics.
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Copyright (c) 2026 Mukhammadjon G. Dadamirzaev, Munirakhon K. Uktamova,, Nosirbek A. Sattarov, Sobir Ruziboyev, A.I. Khudayberdieva

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