Clark, Kendal W. Zhang, X.-G. Gu, Gong Park, Jewook He, Guowei Feenstra, Randall Li, An-Ping Friedel Oscillation-Induced Energy Gap Manifested as Transport Asymmetry at Monolayer-Bilayer Graphene Boundaries <p>We show that Friedel charge oscillation near an interface opens a gap at the Fermi energy for electrons with wave vectors perpendicular to the interface. If the Friedel gaps on two sides of the interface are different, a nonequilibrium effect—shifting of these gaps under bias—leads to asymmetric transport upon reversing the bias polarity. The predicted transport asymmetry is revealed by scanning tunneling potentiometry at monolayer-bilayer interfaces in epitaxial graphene on SiC(0001). This intriguing interfacial transport behavior opens a new avenue toward novel quantum functions such as quantum switching.</p> Condensed Matter Physics;Graphene;Scanning Tunneling Microscopy 2014-02-01
    https://kilthub.cmu.edu/articles/journal_contribution/Friedel_Oscillation-Induced_Energy_Gap_Manifested_as_Transport_Asymmetry_at_Monolayer-Bilayer_Graphene_Boundaries/6506828
10.1184/R1/6506828.v1