Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5466711 | Ultramicroscopy | 2017 | 21 Pages |
Abstract
While imaging individual atoms can routinely be achieved in high resolution transmission electron microscopy, visualizing the potential distribution of individually charged adsorbates leading to a phase shift of the probing electron wave is still a challenging task. Low-energy electrons (30â¯-â¯250â¯eV) are sensitive to localized potential gradients. We employed low-energy electron holography to acquire in-line holograms of individual charged impurities on free-standing graphene. By applying an iterative phase retrieval reconstruction routine we recover the potential distribution of the localized charged impurities present on free-standing graphene.
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Authors
Tatiana Latychevskaia, Flavio Wicki, Conrad Escher, Hans-Werner Fink,