Abstract
Light absorption by GaAs/AlAs heterostructures with a layer of self-assembled InAs quantum dots (QDs) at resonant tunneling through an energy-selected QD has been investigated. A high sensitivity of the current through this selected tunneling channel to the absorption of single photons with a wavelength λ ≲ 860 nm up to a temperature of 50 K is demonstrated; this sensitivity is caused by the Coulomb effect of the photoexcited holes captured by surrounding QDs on the resonance conditions. It is shown that single-photon absorption can discretely change the current through the system under study by a factor of more than 50. The captured-hole lifetimes have been measured, and a model has been developed to qualitatively describe the experimental data. It is also demonstrated that the InAs monolayer can effectively absorb photons. The properties of the heterostructure studied can be used not only to detect photons but also to design logical valves and optical memory devices.
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Original Russian Text © Yu.N. Khanin, E.E. Vdovin, 2010, published in Zhurnal Éksperimental’noĭ i Teoreticheskoĭ Fiziki, 2010, Vol. 138, No. 2, pp. 302–310.
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Khanin, Y.N., Vdovin, E.E. Detection of single photons by a resonant tunneling heterostructure with a quantum dot layer. J. Exp. Theor. Phys. 111, 269–275 (2010). https://doi.org/10.1134/S1063776110080194
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DOI: https://doi.org/10.1134/S1063776110080194