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. 2017 Sep 21;7:12069. doi: 10.1038/s41598-017-12281-y

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© The Author(s) 2017

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

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Band energy variation as a function of the buckling distance, without spin-orbital interaction. Γ_CB and Γ_VB represent the conduction band and valence band energy at the $\vec{Γ}$ point. Γ_gap is the energy difference between the conduction and valence bands (Γ_CB − Γ_VB). K _CB,VB represents the degenerate energy of the conduction and valence bands in the $\vec{K}$ point. All the energies are relative to the Fermi level.