Evidencing the need for high spatial resolution in angle-resolved photoemission experiments

Frédéric Joucken, Nicolas Reckinger, Stéphane Lorcy, José Avila, Chaoyu Chen, Jérôme Lagoute, Jean-François Colomer, Jacques Ghijsen, Maria Carmen Asensio, Robert Sporken

    Research output: Contribution to journalArticlepeer-review

    Abstract

    Angle-resolved photoemission spectroscopy (ARPES) is the most direct tool to measure the electronic structure of materials. In particular, fine features of the spectra can be analyzed for evaluating the electron self-energy. Owing to a setup allowing ARPES investigation with submicron resolution and state-of-the-art energy and momentum resolution, we show here first that ARPES spectra of pristine and virtually undoped monolayer graphene acquired on a small spot do not display manifestations of self-energy. We next demonstrate that, although the region of the sample investigated is a unique graphene domain, it displays faint spatial inhomogeneity, both in its crystallographic orientation and its thickness, which is undetectable with conventional ARPES but renders the spectra improper for self-energy extraction. These results indicate that care should be taken when analyzing ARPES spectra obtained with poor spatial resolution.

    Original languageEnglish
    Article number241101
    Number of pages8
    JournalPhyscal Review B
    Volume93
    Issue number24
    DOIs
    Publication statusPublished - 9 Jun 2016

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