{"type":"journal_article","abstract":[{"text":"Lead halide perovskites have recently been reported to demonstrate an exceptionally high nonlinear (Kerr) refractive index n2 of up to 10−8cm2/W in CH3⁢NH3⁢PbBr3. Other researchers, however, observe different, substantially more conservative numbers. In order to resolve this disagreement, the nonlinear Kerr index of a bulk sample of lead halide perovskite was measured directly by means of an interferometer. This approach has many advantages as compared to the more standard z-scan technique. In particular, this method allows studying the induced changes to the refractive index in a time-resolved manner, thus enabling to separate the different contributions to 𝑛2. The extracted 𝑛2 values for CsPbBr3 and MAPbBr3 at 𝜆≈1µ⁢m are 𝑛2=+2.1×10−14cm2/W and 𝑛2=+6×10−15cm2/W, respectively. Hence, these values are substantially lower than what has been indicated in most of the previous reports, implying the latter one should be regarded with great care.","lang":"eng"}],"oa_version":"None","date_created":"2024-09-01T22:01:08Z","status":"public","citation":{"mla":"Lorenc, Dusan, et al. “No Extraordinary χ(3) in Lead-Halide Perovskites: Placing an Upper Bound on Kerr Nonlinearity by Means of Time-Resolved Interferometry.” <i>Physical Review Materials</i>, vol. 8, no. 8, 085403, American Physical Society, 2024, doi:<a href=\"https://doi.org/10.1103/PhysRevMaterials.8.085403\">10.1103/PhysRevMaterials.8.085403</a>.","ieee":"D. Lorenc, A. Zhumekenov, O. M. Bakr, and Z. Alpichshev, “No extraordinary χ(3) in lead-halide perovskites: Placing an upper bound on Kerr nonlinearity by means of time-resolved interferometry,” <i>Physical Review Materials</i>, vol. 8, no. 8. American Physical Society, 2024.","short":"D. Lorenc, A. Zhumekenov, O.M. Bakr, Z. Alpichshev, Physical Review Materials 8 (2024).","ista":"Lorenc D, Zhumekenov A, Bakr OM, Alpichshev Z. 2024. No extraordinary χ(3) in lead-halide perovskites: Placing an upper bound on Kerr nonlinearity by means of time-resolved interferometry. Physical Review Materials. 8(8), 085403.","apa":"Lorenc, D., Zhumekenov, A., Bakr, O. M., &#38; Alpichshev, Z. (2024). No extraordinary χ(3) in lead-halide perovskites: Placing an upper bound on Kerr nonlinearity by means of time-resolved interferometry. <i>Physical Review Materials</i>. American Physical Society. <a href=\"https://doi.org/10.1103/PhysRevMaterials.8.085403\">https://doi.org/10.1103/PhysRevMaterials.8.085403</a>","chicago":"Lorenc, Dusan, Ayan Zhumekenov, Osman M. Bakr, and Zhanybek Alpichshev. “No Extraordinary χ(3) in Lead-Halide Perovskites: Placing an Upper Bound on Kerr Nonlinearity by Means of Time-Resolved Interferometry.” <i>Physical Review Materials</i>. American Physical Society, 2024. <a href=\"https://doi.org/10.1103/PhysRevMaterials.8.085403\">https://doi.org/10.1103/PhysRevMaterials.8.085403</a>.","ama":"Lorenc D, Zhumekenov A, Bakr OM, Alpichshev Z. No extraordinary χ(3) in lead-halide perovskites: Placing an upper bound on Kerr nonlinearity by means of time-resolved interferometry. <i>Physical Review Materials</i>. 2024;8(8). doi:<a href=\"https://doi.org/10.1103/PhysRevMaterials.8.085403\">10.1103/PhysRevMaterials.8.085403</a>"},"article_processing_charge":"No","month":"08","date_published":"2024-08-23T00:00:00Z","publisher":"American Physical Society","year":"2024","language":[{"iso":"eng"}],"acknowledgement":"We gratefully acknowledge the assistance of Prof. John\r\nDudley.","corr_author":"1","department":[{"_id":"ZhAl"}],"article_number":"085403","volume":8,"user_id":"8b945eb4-e2f2-11eb-945a-df72226e66a9","intvolume":"         8","title":"No extraordinary χ(3) in lead-halide perovskites: Placing an upper bound on Kerr nonlinearity by means of time-resolved interferometry","quality_controlled":"1","doi":"10.1103/PhysRevMaterials.8.085403","date_updated":"2024-09-06T09:30:39Z","day":"23","publication":"Physical Review Materials","author":[{"id":"40D8A3E6-F248-11E8-B48F-1D18A9856A87","first_name":"Dusan","full_name":"Lorenc, Dusan","last_name":"Lorenc"},{"first_name":"Ayan","last_name":"Zhumekenov","full_name":"Zhumekenov, Ayan"},{"full_name":"Bakr, Osman M.","last_name":"Bakr","first_name":"Osman M."},{"id":"45E67A2A-F248-11E8-B48F-1D18A9856A87","full_name":"Alpichshev, Zhanybek","last_name":"Alpichshev","orcid":"0000-0002-7183-5203","first_name":"Zhanybek"}],"publication_identifier":{"eissn":["2475-9953"]},"publication_status":"published","_id":"17476","article_type":"original","issue":"8","scopus_import":"1"}