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Title
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Auger electron emission initiated by the creation of valence-band holes in graphene by positron annihilation
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Author
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Abstract
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| Auger processes involving the filling of holes in the valence band are thought to make important contributions to the low-energy photoelectron and secondary electron spectrum from many solids. However, measurements of the energy spectrum and the efficiency with which electrons are emitted in this process remain elusive due to a large unrelated background resulting from primary beam-induced secondary electrons. Here, we report the direct measurement of the energy spectra of electrons emitted from single layer graphene as a result of the decay of deep holes in the valence band. These measurements were made possible by eliminating competing backgrounds by employing low-energy positrons (<1.25 eV) to create valence-band holes by annihilation. Our experimental results, supported by theoretical calculations, indicate that between 80 and 100% of the deep valence-band holes in graphene are filled via an Auger transition. |
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Language
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English
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Source (journal)
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Nature communications
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Publication
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2017
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ISSN
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2041-1723
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DOI
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10.1038/NCOMMS16116
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Volume/pages
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8
(2017)
, 7 p.
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Article Reference
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16116
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ISI
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000405398200001
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Pubmed ID
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28703225
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Medium
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E-only publicatie
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Full text (Publisher's DOI)
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Full text (open access)
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