Excitonic oscillator-strength saturation dominates polariton-polariton interactions
Year: 2026
Authors: Richard M., Fryrot I., Ravets S., Bloch J., Anton-Solanas C., Claude F., Zhou Y.G., Lemaotre A., Morassi M., Carusotto I., Minguzzi A.
Autors Affiliation: Univ Cote Dazur, Nanyang Technol Univ, French Natl Ctr Sci Res,Sorbonne Univ, Majulab Int Res Lab,Natl Univ Singapore, Singapore 117543, Singapore; Natl Univ Singapore, Ctr Quantum Technol, Singapore 117543, Singapore; ENS PSL Res Univ, Sorbonne Univ, CNRS, Lab Kastler Brossel,Coll France, 4 Pl Jussieu, F-75005 Paris, France; Univ Paris Saclay, Univ Paris Sud, CNRS, Ctr Nanosci & Nanotechnol, F-91120 Palaiseau, France; Univ Autonoma Madrid, Inst Fis Mat Condensada, Inst Nicolas Cabrera, Dept Fis Mat, Madrid 28049, Spain; Univ Trento, Pitaevskii BEC Ctr, CNR INO, Via Sommar 14, I-38123 Trento, Italy; Univ Trento, Dipartimento Fis, Via Sommar 14, I-38123 Trento, Italy; Univ Grenoble Alpes, CNRS, LPMMC, F-38000 Grenoble, France.
Abstract: Exciton-polaritons in semiconductor microcavities exhibit large two-body interactions that, thanks to everrefined nanotechnology techniques, are getting closer and closer to the quantum regime where single-photon nonlinearities start being relevant. To foster additional progress in this direction, in this work we experimentally investigate the microscopic mechanism driving polariton-polariton interactions. We measure the dispersion relation of the collective excitations that are thermally generated on top of a coherent fluid of interacting lower polaritons. By comparing the measurements with the Bogoliubov theory over both the lower- and upper-polariton branches simultaneously, we find that polariton-polariton interactions stem dominantly from a mechanism of saturation of the exciton oscillator strength.
Journal/Review: PHYSICAL REVIEW RESEARCH
Volume: 8 (1) Pages from: L012039-1 to: L012039-7
More Information: M.R., F.C., and Y.Z. acknowledge support by the Singa-pore’s National Research Foundation through the National Quantum Office, hosted in A*STAR, under its Centre for Quantum Technologies Funding Initiative (S24Q2d0009) , and from the National Research Foundation via CNRS@CREATE internal grant NGAP. I.C. acknowledges financial support from the Provincia Autonoma di Trento, from the Q@TN Initiative, and from the National Quantum Science and Tech-nology Institute through the PNRR MUR Project under Grant No. PE0000023-NQSTI, co-funded by the European Union- NextGeneration EU. This work was partly supported by the Paris Ile de France Region in the framework of DIM SIRTEQ and DIM QuanTIP, by the RENATECH network, by the Eu-ropean Research Council (ERC) under the European Union’s Horizon 2020 research and innovation programme (Project ARQADIA, Grant Agreement No. 949730) , and under Hori-zon Europe research and innovation programme (ANAPOLIS, Grant Agreement No. 101054448) . Data availability. The data that support the findings of this article are openly available [68] .KeyWords: Quantum Key Distribution; Photon; ScatteringDOI: 10.1103/r8m8-hckx
