Destefani, C. F., Villani, M., Cartoixà, X., Feiginov, M., & Oriols, X. (2022). Resonant tunneling diodes in semiconductor microcavities: Modeling polaritonic features in the terahertz displacement current. Physical Review B, 106(20), Article 205306. https://doi.org/10.1103/PhysRevB.106.205306
We develop in this work a qualitative quantum electron transport model, in the strong light-matter coupling regime under dipole approximation, able to capture polaritonic signatures in the time-dependent electrical current. The effect of the quantized electromagnetic field in the displacement current of a resonant tunneling diode inside an optical cavity is analyzed. The original peaks of the bare electron transmission coefficient split into two new peaks due to the resonant electron-photon interaction, leading to coherent Rabi oscillations among the polaritonic states that are developed in the system in the strong coupling regime. This mimics known effects predicted by a Jaynes-Cummings model in closed systems and shows how a full quantum treatment of electrons and electromagnetic fields may open interesting paths for engineering new THz electron devices. The computational burden involved in the multi-time measurements of THz currents is tackled by invoking a Bohmian description of the light-matter interaction. We also show that the traditional static transmission coefficient used to characterize DC quantum electron devices has to be substituted by a new displacement current coefficient in high-frequency AC scenarios.
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Research Areas:
Quantum Modeling and Simulation: 30% Quantum Many-body Systems Physics: 30% Nanoelectronics: 40%