H-BN shows an indirect bandgap at 5.955 eV by means of optical spectroscopy also in DFT study(At B3LYP method) H-BN monolayer has a bandgap of ∼ 6 to 6.4 eV. So, normally its an insulator.
This is essentially due to the difference between the 2p orbital energies in the Boron and Nitrogen atoms. A detailed discussion, with a comparison with the case o graphite is given in the beautiful book by F. Bassani and
G. Pastori Parravicini, "Electronic states and optical transitions in solids", published by Pergamon press.
A pdf copy of the book can be found under:
the science of the solid state - general editor: br pamplin
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ResearchGate
https://www.researchgate.net › post › download
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OPTICAL TRANSITIONS. IN SOLIDS by. F. BASSANI. Professor of Solid State Physics, University of Rome ... Electronic states and optical transitions in solids.
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