Article

Andreev reflection and momentum filtering in quantum-wire/superconductive-graphene/quantum-wire junction

Ames Laboratory-US DOE, and Department of Physics and Astronomy, Iowa State University, Ames, IA 50011, United States; Department of Physics, Renmin University of China, Beijing 100872, China
Physics Letters A DOI:10.1016/j.physleta.2010.12.082

ABSTRACT Transport property of superconductive armchair graphene ribbon (AGR) connected to quantum-wire (QW) contacts is investigated via Landauer formalism combined with transfer matrix method. The scattering at the AGR/QW interface induces an obvious asymmetry in conductance as gate voltage varies. The transmission peak is located at momentum with a=0.142 nm. Andreev reflection (AR) enhances electronic transmission in the presence of hole reflection process. At lowest carrier density, the conductance of AGR in superconductive state becomes constant while the counterpart of semiconductive AGR in normal state decays exponentially with the length. The conductance increases with pair potential at low carrier density. The interplay between superconductivity and the scattering at the AGR/QW interface guides future application of superconductive graphene ribbon.

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Keywords

AGR
 
AGR/QW interface guides future application
 
AGR/QW interface induces
 
conductance
 
conductance increases
 
gate voltage varies
 
lowest carrier density
 
normal state decays exponentially
 
QW
 
scattering
 
semiconductive AGR
 
superconductive armchair graphene ribbon
 
superconductivity
 
transfer matrix method
 
transmission peak