Quantum Interference in Graphene Nanoconstrictions

• DOI: 10.1021/acs.nanolett.6b01104
• Publication Date: 2016-06-13T22:11:23Z
• Authors: Pascal Gehring; Hatef Sadeghi; Sara Sangtarash; Chit Siong Lau; Junjie Liu; Arzhang Ardavan; Jamie H. Warner; Colin J. Lambert; G. Andrew. D. Briggs; Jan A. Mol
• Keywords: Condensed Matter - Mesoscale and Nanoscale Physics; Fabry-Perot; Fabry−Perot; quantum interference; FOS: Physical sciences; 02 engineering and technology; 530; Mesoscale and Nanoscale Physics (cond-mat.mes-hall); Fano resonance; break junction; Graphene; 0210 nano-technology

We report quantum interference effects in the electrical conductance of chemical vapor deposited graphene nanoconstrictions fabricated using feedback controlled electroburning. The observed multimode Fabry-Perot 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-Perot interference patterns. This study provides new insight into the interplay between two fundamental forms of quantum interference in graphene nanoconstrictions.