On the Theory of Novel Solid-State Terahertz Sources: Renormalization and Bloch Equations
The theoretical foundation of the author's chemical approach to novel solid-state THz sources is given a more fundamental justification. The chemical approach is based on a phenomenological Michaelis-Menten type of kinetic rate equations describing the limit-cycle autonomous-current oscillations of resonant tunneling diodes (RTDs). A more fundamental justification presented here is based on a renormalization of the multi-band quantum transport equations in the electron–hole representation. To shed more light on the parameters of the theory, this renormalization approach is further developed by considering the selfconsistent quantum-dynamical interaction between the quantized energy level of the emitter and discrete energy level of the quantum well (QW) as a tunnel-coupled two site-states quantum systems. This view is used to formulate the Bloch equations with dielectric relaxation rate to account for the selfconsistent-potential response to nonstationary redistribution of charges between the emitter and the quantum well causing a temporal mismatch between their energy levels. The QW density also serves as a catalyst for tunneling between emitter and QW. These two counteracting physical influences result in autonomous current oscillations around the resonance condition.
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Document Type: Research Article
Publication date: October 1, 2006
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