Publication date: Mar 10, 2023
The conversion of semimetallic suspended graphene (Gr) to a large-gap semiconducting phase is realized by controlled adsorption of atomic hydrogen (deuterium) on free-standing Gr veils in nanoporous graphene. The effects of local rehybridization from sp² to sp³ chemical bonding are investigated by combining X-ray photoelectron spectroscopy and high-resolution electron energy-loss spectroscopy (HREELS) with ab-initio based modelling. The hydrogen adatoms on the C sites induce a stretching frequency, clearly identified in vibrational spectra thanks to the use of the D isotope, which is compatible with the predicted fingerprints of adsorption on both sides of Gr corresponding to the graphane configuration. HREELS of the deuterated samples shows a wide opening of the optical band gap, consistent with the modified spectral density observed in the valence band photoemission. The results are in agreement with ab-initio calculations by GW and Bethe-Salpeter equation approaches, showing a large quasiparticle gap opening and huge excitonic binding energy
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raw_input_output.tar.gz
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613.4 KiB | Raw Yambo and quantumESPRESSO inputs and outputs |
README.txt
MD5md5:f05dbc1840a98a5751b255d722e69728
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980 Bytes | Information on this entry |
structures.tar.gz
MD5md5:b05b0c32429a6de1447af8dcdedbc30e
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1.2 KiB | Structures of the H-graphene prototypes. xsf format. |
optical_gaps.json
MD5md5:320659a3d6a5afc07fae5040478a0761
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267 Bytes | BSE (and GW) gaps for all the systems studied. |
2023.40 (version v2) [This version] | Mar 10, 2023 | DOI10.24435/materialscloud:9b-34 |
2022.167 (version v1) | Dec 07, 2022 | DOI10.24435/materialscloud:mr-ge |