Imaging coherent transport in chemical vapor deposition graphene wide constriction by scanning gate microscopy
Journal
Applied Physics Letters
Journal Volume
108
Journal Issue
12
Date Issued
2016
Author(s)
Chuang, C.
Matsunaga, M.
Liu, F.-H.
Woo, T.-P.
Lin, L.-H.
Oto, K.
Ochiai, Y.
Liang, C.-T.
Abstract
We use a scanning gate microscopy to perturb coherent transport in chemical vapor deposition (CVD) graphene wide constriction. Particularly, we observe conductance oscillations in the wide constriction region (W ∼ 800 nm) characterized by spatial conductance variations, which imply formation of the nanometer-scale ring structure due to the merged domains and intrinsic grain boundaries. Moreover, additional hot charges from high current can suppress the coherent transport, suggesting that the hot carriers with a wide spreading kinetic energy could easily tunnel merged domains and intrinsic grain boundaries in CVD-grown graphene due to the heating effect, a great advantage for applications in graphene-based interference-type nano-electronics.
SDGs
Type
journal article