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 language | English |
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Article number | 011021 |
Journal | Physical Review X |
Volume | 4 |
Issue number | 1 |
DOIs | |
State | Published - 2014 |
Keywords
- Condensed matter physics
- Graphene