Self-Kerr effect across the yellow $\mathrm{Cu_2O}$ Rydberg series

• URL: http://arxiv.org/abs/2202.09239v1
• Date: Fri, 18 Feb 2022 15:06:41 GMT
• Title: Self-Kerr effect across the yellow $\mathrm{Cu_2O}$ Rydberg series
• Authors: Corentin Morin, J\'er\^ome Tignon, Juliette Mangeney, Sukhdeep Dhillon, Gerard Czajkowski, Karol Karpi\'nski, Sylwia Zieli\'nska-Raczy\'nska, David Ziemkiewicz and Thomas Boulier
• Abstract summary: We investigate the nonlinear refraction induced by Rydberg excitons in $mathrmCuO$. We observe significant shifts at extremely low laser intensity near each exciton resonance. We explain this with the Rydberg mechanism, whereby giant Rydberg interactions limit the exciton density.
• Score: 0.0
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: We investigate the nonlinear refraction induced by Rydberg excitons in $\mathrm{Cu_2O}$. Using a high-precision interferometry imaging technique that spatially resolves the nonlinear phase shift, we observe significant shifts at extremely low laser intensity near each exciton resonance. From this, we derive the nonlinear index $\mathrm{n_2}$, present the $\mathrm{n_2}$ spectrum for $n\geq 5$ and report large $\mathrm{n_2}$ values of order $10^{-3}$ mm$^2$/mW. Moreover, we observe a rapid saturation of the Kerr nonlinearity and find that the saturation intensity $\mathrm{I_{sat}}$ decreases as $n^{-7}$. We explain this with the Rydberg blockade mechanism, whereby giant Rydberg interactions limit the exciton density, resulting in a maximum phase shift of 0.5 rad in our setup.

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