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While imaging individual atoms can routinely be achieved in high resolutiontransmission electron microscopy, visualizing the potential distribution ofindividually charged adsorbates leading to a phase shift of the probingelectron wave is still a challenging task. Low-energy electrons (30 - 250 eV)are sensitive to localized potential gradients. We employed low-energy electronholography to acquire in-line holograms of individual charged impurities onfree-standing graphene. By applying an iterative phase retrieval reconstructionroutine we recover the potential distribution of the localized chargedimpurities present on free-standing graphene.

Imaging the potential distribution of individual charged impurities on graphene by low-energy electron holography