Energy gap induced by friedel oscillations manifested as transport asymmetry at Monolayer-Bilayer graphene boundaries

Kendal W. Clark, X. G. Zhang, Gong Gu, Jewook Park, Guowei He, R. M. Feenstra, An Ping Li

Research output: Contribution to journalArticlepeer-review

44 Scopus citations

Abstract

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.

Original languageEnglish
Article number011021
JournalPhysical Review X
Volume4
Issue number1
DOIs
StatePublished - 2014

Keywords

  • Condensed matter physics
  • Graphene

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