Exciton spectra in vertical stacks of triple and quadruple quantum dots in an electric field - Condensed Matter > Mesoscale and Nanoscale PhysicsReportar como inadecuado




Exciton spectra in vertical stacks of triple and quadruple quantum dots in an electric field - Condensed Matter > Mesoscale and Nanoscale Physics - Descarga este documento en PDF. Documentación en PDF para descargar gratis. Disponible también para leer online.

Abstract: We study an electron-hole pair in a stack of multiple quantum dots in thepresence of an external electric field using the configuration interactionapproach. We find that the bright energy levels can be grouped into familieswhich are associated with the hole localized in a specific dot of the stack.The exciton energy levels undergo avoided crossings as function of the externalelectric field with different pattern for each family. We show that thevariation of the depths of the dots along the stack can be deduced from theexciton spectrum. In the strong confinement limit the families are mixed by aweak electric field due to hole tunneling. This results in a characteristicmultiple avoided crossing of energy levels belonging to different families withan accompanying modulation of the recombination probabilities and an appearanceof a single particularly bright state. We discuss the modification of thespectrum when dots are added to the stack.



Autor: B. Szafran, E. Barczyk, F.M. Peeters, S. Bednarek

Fuente: https://arxiv.org/







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