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. 2023 Jun 17;13:9849. doi: 10.1038/s41598-023-37099-9

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© The Author(s) 2023

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(a) Comparison of the band gap variation by strain obtained from tight-binding and DFT calculations⁴⁴. The fitting parameters are $g_{1} = E_{F}$ and $g_{2} = 0.37 E_{F}$ . (b) Band gap versus compressive and tensile strain along the different directions.