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Data availability
The datasets generated during and/or analysed during the current study are available from the corresponding author on reasonable request.
References
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Acknowledgements
Q.S., C.A.O. and R.C. acknowledge support from the US Department of Energy, BES under award number DE-SC0019126 (materials synthesis and characterization), from the National Science Foundation under grant no. DMR-1751739 (optical measurements) and from the STC Center for Integrated Quantum Materials, NSF grant no. DMR-1231319 (device fabrication). E.E., B.I. and N.G. acknowledge support from the US Department of Energy, BES DMSE (data taking and analysis) and Gordon and Betty Moore Foundation’s EPiQS Initiative grant GBMF9459 (instrumentation). J.K. and A.S.B. acknowledge NSF grant no. DMR-1904716 and the ASU research computing centre for HPC resources. D.A. and S.P. acknowledge support by the Nanoscience Foundries and Fine Analysis (NFFA-MIUR Italy) project. P.B. and S.P. acknowledge financial support from the Italian Ministry for Research and Education through PRIN-2017 projects ‘Tuning and understanding Quantum phases in 2D materials—Quantum 2D’ (IT-MIUR grant no. 2017Z8TS5B) and ‘TWEET: Towards Ferroelectricity in two dimensions’ (IT-MIUR grant no. 2017YCTB59), respectively. D.A., P.B. and S.P. also acknowledge high-performance computing systems operated by CINECA (IsC722DFmF, IsC80-Em2DvdWd, IsC88-FeCoSMO and IsB21-IRVISH projects) and computing resources at the Pharmacy Department, University of Chieti-Pescara, and thank L. Storchi for technical support.
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Q.S. and R.C. conceived the project. Q.S. synthesized the NiI2 samples. Q.S. and C.A.O. performed Raman and birefringence measurements, supervised by R.C. E.E. and B.I. performed SHG measurements, supervised by N.G. T.T. and K.W. provided and characterized bulk hexagonal boron nitride crystals. D.A., A.S.B. and J.K. performed first-principles calculations. P.B. and D.A. performed Monte Carlo simulations, and discussed the results with S.P. All authors contributed to the writing of the paper.
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Song, Q., Occhialini, C.A., Ergeçen, E. et al. Reply to: Dilemma in optical identification of single-layer multiferroics. Nature 619, E44–E46 (2023). https://doi.org/10.1038/s41586-023-06108-2
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DOI: https://doi.org/10.1038/s41586-023-06108-2
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