Quantum Interference in Graphene Nanoconstrictions.
We report quantum interference effects in the electrical conductance of chemical vapor deposited graphene nanoconstrictions fabricated using feedback controlled electroburning. The observed multimode Fabry-Pérot interferences can be attributed to reflections at potential steps inside the channel. Sharp antiresonance features with a Fano line shape are observed. Theoretical modeling reveals that these Fano resonances are due to localized states inside the constriction, which couple to the delocalized states that also give rise to the Fabry-Pérot interference patterns. This study provides new insight into the interplay between two fundamental forms of quantum interference in graphene nanoconstrictions.
Department of Materials, University of Oxford , 16 Parks Road, Oxford OX1 3PH, United Kindom.
Pascal
P
Gehring
Quantum Technology Centre, Physics Department, Lancaster University , Lancaster LA1 4YB, United Kingdom.
Hatef
H
Sadeghi
Quantum Technology Centre, Physics Department, Lancaster University , Lancaster LA1 4YB, United Kingdom.
Sara
S
Sangtarash
Department of Materials, University of Oxford , 16 Parks Road, Oxford OX1 3PH, United Kindom.
Chit Siong
CS
Lau
Department of Materials, University of Oxford , 16 Parks Road, Oxford OX1 3PH, United Kindom.
Junjie
J
Liu
Clarendon Laboratory, Department of Physics, University of Oxford , Parks Road, Oxford OX1 3PU, United Kingdom.
Arzhang
A
Ardavan
Department of Materials, University of Oxford , 16 Parks Road, Oxford OX1 3PH, United Kindom.
Jamie H
JH
Warner
Quantum Technology Centre, Physics Department, Lancaster University , Lancaster LA1 4YB, United Kingdom.
Colin J
CJ
Lambert
Department of Materials, University of Oxford , 16 Parks Road, Oxford OX1 3PH, United Kindom.
G Andrew D
GA
Briggs
Department of Materials, University of Oxford , 16 Parks Road, Oxford OX1 3PH, United Kindom.
Jan A
JA
Mol
Fabry−Pérot; Fano resonance; Graphene; break junction; quantum interference