Quantum confined Rydberg excitons in Cu${}_2$O nanoparticles

Abstract

The quantum confinement of Rydberg excitons is an important step towards exploiting their large nonlinearities for quantum applications. We observe Rydberg excitons in natural nanoparticles of Cu${}_2$O. We resolve up to the principal quantum number $n=12$ in a bulk Cu${}_2$O crystal and up to $n=6$ in nanoparticles extracted from the same crystal. The exciton transitions in nanoparticles are broadened and their oscillator strengths decrease as $\propto n^{-4}$ compared to those in the bulk (decreasing as $\propto n^{-3}$). We explain our results by including the effect of quantum confinement of exciton states in the nanoparticles. Our results provide an understanding of the physics of Cu${}_2$O Rydberg excitons in confined dimensions.

arXiv comment5 pages, 5 figures

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Cited by in corpus (7)

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• Strong photon interactions from weakly interacting particles
• Electro-optical properties of excitons in Cu${}_2$O quantum wells: I discrete states
• Optical to microwave frequency conversion with Rydberg excitons
• Electro-optical properties of excitons in Cu${}_2$O quantum wells: II continuum states
• Nonlinear optical properties and Kerr nonlinearity of Rydberg excitons in Cu${}_2$O quantum wells