Imaging coherent transport in a mesoscopic graphene ring

Damien Cabosart, Sébastien Faniel, Frederico Martins, Boris Brun, Alexandre Felten, Vincent Bayot, Benoit Hackens

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

    Résumé

    Mesoscopic graphene devices often exhibit complex transport properties, stemming both from the peculiar electronic band structure of graphene and from the high sensitivity of transport to local disorder in this two-dimensional crystal. To disentangle contributions of disorder in the different transport phenomena at play in such devices, it is necessary to devise new local-probe methods and to establish links between transport and the microscopic structure of the devices. Here, we present a spatially resolved investigation of coherent transport inside a graphene quantum ring (QR), where Aharonov-Bohm conductance oscillations are observed. Thanks to scanning gate microscopy (SGM), we first identify spatial signatures of the Coulomb blockade, associated with disorder-induced localized states, and of charge-carrier interferences. We then image resonant states which decorate the QR local density of states (LDOS). Simulations of the LDOS in a model disorder graphene QR and temperature dependence of SGM maps confirm the presence of such scarred states.

    langue originaleAnglais
    Numéro d'article205433
    journalPhysical Review B - Condensed Matter and Materials Physics
    Volume90
    Numéro de publication20
    Les DOIs
    Etat de la publicationPublié - 25 nov. 2014

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