10.1184/R1/6506828.v1
Kendal W. Clark
Kendal W.
Clark
X.-G. Zhang
X.-G.
Zhang
Gong Gu
Gong
Gu
Jewook Park
Jewook
Park
Guowei He
Guowei
He
Randall Feenstra
Randall
Feenstra
An-Ping Li
An-Ping
Li
Friedel Oscillation-Induced Energy Gap Manifested as Transport Asymmetry at Monolayer-Bilayer Graphene Boundaries
Carnegie Mellon University
2014
Condensed Matter Physics
Graphene
Scanning Tunneling Microscopy
2014-02-01 00:00:00
Journal contribution
https://kilthub.cmu.edu/articles/journal_contribution/Friedel_Oscillation-Induced_Energy_Gap_Manifested_as_Transport_Asymmetry_at_Monolayer-Bilayer_Graphene_Boundaries/6506828
<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>