Interaction effects in a chaotic graphene quantum billiard

Imre Hagymási, Péter Vancsó, András Pálinkás, Zoltán Osváth

    Résultats de recherche: Contribution à un journal/une revueArticleRevue par des pairs

    Résumé

    We investigate the local electronic structure of a Sinai-like, quadrilateral graphene quantum billiard with zigzag and armchair edges using scanning tunneling microscopy (STM) at room temperature. It is revealed that besides the (3×3)R30 superstructure, which is caused by the intervalley scattering, its overtones also appear in the STM measurements, which are attributed to the Umklapp processes. We point out that these results can be well understood by taking into account the Coulomb interaction in the quantum billiard, accounting for both the measured density of state values and the experimentally observed topography patterns. The analysis of the level-spacing distribution substantiates the experimental findings as well. We also reveal the magnetic properties of our system which should be relevant in future graphene based electronic and spintronic applications.

    langue originaleAnglais
    Numéro d'article075123
    journalPhysical Review B - Condensed Matter and Materials Physics
    Volume95
    Numéro de publication7
    Les DOIs
    Etat de la publicationPublié - 13 févr. 2017

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