Energy Gap Induced by Friedel Oscillations Manifested as Transport Asymmetry at Monolayer-Bilayer Graphene Boundaries

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 tra...

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Bibliographic Details
Published in:Physical review. X 2014-02, Vol.4 (1), p.011021, Article 011021
Main Authors: Clark, Kendal W., Zhang, X.-G., Gu, Gong, Park, Jewook, He, Guowei, Feenstra, R. M., Li, An-Ping
Format: Article
Language:English
Subjects:
Asymmetry
Bias
Bilayers
Boundary conditions
Chirality
Electrical measurement
Electron density
Electron transport
Energy costs
Energy gap
Graphene
Graphical user interface
Interfaces
Monolayers
Potentiometric analysis
Scanning
Solid surfaces
Standing waves
Topological insulators
Transport phenomena
Wave functions
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Summary: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.
ISSN:2160-3308
2160-3308
DOI:10.1103/PhysRevX.4.011021