Abstract
The non-linear optical rectification (NOR), the generation of the second (SHG) and third harmonic (THG) of a singly ionized double donor (SIDD) confined in an asymmetric \(\mathrm {Ga_{1-x}Al_xAs/GaAs/ Ga_{1-y}Al_yAs}\) V-groove nanowire are theoretically calculated. The calculated energy levels exhibit a molecular-like behavior with anticrossing points due to V-groove’s pinch-offs. The carefully selected morphological parameters values of the V-groove allowed tuning the optical coefficients within the THz band. The NOR, SHG, and THG were found to be strongly dependent on the donor–donor distance. Larger values of the NOR for the SIDD in comparison to the single electron system were obtained. In contrast, larger values of the SHG and THG coefficients for single electrons can be calculated compared to the SIDD at small donor–donor distances.
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Acknowledgements
This work was partially supported by Institución Universitaria Pascual Bravo through the research project entitled: “Estructura opto-electrónica de un complejo molecular \(D_2^+\) en un anillo cuántico no-uniforme en presencia de campos eléctrico y magnético ortogonales” with grant number IN202006. MRF thanks to Universidad Nacional de Colombia for the working time within the research project: “Estudio de la respuesta óptica de átomos hidrogenoides en nano-discos semiconductores” with grant number 47063. EGT, JLP, and GLM, thank to Universidad EIA for the working time through the research project entitled: “Propiedades Optoelectrónicas de Sistemas de Pocas Partículas en V-Grooves Cuánticos Semiconductores”, with grant number CO12021001.
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Giraldo-Tobón, E., Palacio, J.L., Miranda, G.L. et al. Non-linear response under terahertz radiation of an asymmetric Ga1−xAlxAs/GaAs/Ga1−yAlyAs V-groove nanowire confining a singly-ionized double donor. J Mater Sci 57, 8406–8416 (2022). https://doi.org/10.1007/s10853-021-06738-9
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DOI: https://doi.org/10.1007/s10853-021-06738-9