Abstract
Two possible InGaAs/GaAs quantum-well structures ensuring the presence of radiative transitions between the polariton states in a microresonator with a quantum well, which are accompanied by generation of terahertz photons, are discussed in this work. For the first structure, symmetry breakdown that is required for the emission of a terahertz photon is conducted in a quantum well with refractive index gradient profile, which results in mixing of the states of a polariton and a dark exciton. Parameters of the quantum well, in which the energy of the second exciton level corresponds to the upper polariton energy, are determined. A double quantum well with exciton states split due to quantum-mechanical tunneling through a barrier is used in the second structure. Symmetry breakdown, which allows one to mix an exciton with a “dark” exciton, is ensured by adjusting the energy of electron levels in a double quantum well by applying an electric field to the structure. A hole remains localized in one of the wells.
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Original Russian Text © I.V. Iorsh, M.A. Kaliteevski, K.A. Ivanov, K.V. Kavokin, 2013, published in Pis’ma v Zhurnal Tekhnicheskoi Fiziki, 2013, Vol. 39, No. 15, pp. 56–63.
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Iorsh, I.V., Kaliteevski, M.A., Ivanov, K.A. et al. Mixing of states in quantum wells for terahertz polariton emitters. Tech. Phys. Lett. 39, 694–697 (2013). https://doi.org/10.1134/S1063785013080075
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DOI: https://doi.org/10.1134/S1063785013080075